Thanks for all your support. Some of you may have noticed a little downtime. I invested a little professional expertise in the site and you should now see better performance and more site reliability and uptime. Special thanks to Gregory Morozov at upwork.com who quickly identified and resolved the following issues:
Convert PHP to php-fpm – for many reasons, but one is control over max php processes (I’ll use: service php7.2-fpm restart – if I need to restart php.)
Relaxed Wordfence triggers so users don’t get denied access
Dropped memory usage from 700+MB to 400MB
Fixed invalid Repos, other updates and maintenance.
We’ll monitor the site usage into the beginning of next week to see if we need to add more memory to the instance.
Say you have a Windows 7 or Windows 10 PC that has Sophos installed on it, but you cannot find the device in the management console in order to disable tamper protection. You want to uninstall Sophos because it is out of date or cannot communicate with the Sophos cloud. However, when you search for the device name in the console, it isn’t listed with the current computer name. The device was probably renamed several times. So how do you remove or uninstall Sophos without disabling tamper protection? My best advice is don’t try to uninstall the client without first disabling tamper protection.
In many instances, the Sophos client is out of date and cannot communicate with “Management Communication”. In the bottom-right corner of the Sophos client, you can click on “About”.
Here we can find the “Run Diagnostic Tool”. After running the tool you may find some errors such as the following: Last Communication – Failed with error ‘504 Gateway Time-out’ at 08:40:48 Jun 28, 2019 (UTC-07:00)
Reading the knowledge base articles about this and attempting to restart MCS Client services etc didn’t work for me. Instead, we need to find the identifier for the device so that we can get to the device page and obtain the Tamper Protection Password. To do this, on the computer with the bad installation of Sophos, open the File Explorer and go to:
C:\programdata\sophos\management communication system\endpoint\persist\
Inside this directory we will want to open the file named EndpointIdentity.txt
Copy the string of letters and numbers into your clipboard.
Next, log into your Sophos Cloud Console at https://cloud.sophos.com/manage/login then go to Overview > Devices. Click on any existing device and you’ll be directed to the page of that identity. At the top of the page, replace the identity string of the device you copied from the EndpointIdentity.txt file into the URL of the sample device, then hit Enter.
You should now be directed to the page with the correct device identity and password to disable Tamper Protection.
*If this article helped you please click on an ad to help pay for hosting and new content. 🙂
So for the past 12 months or so I’ve tried my hand had trading options on Robinhood and TD Ameritrade, and I want to pass on what I’ve learned so perhaps someone new to options can get a head start. *Disclaimer: I’m in no way endorsing or advocating trading options. What you do with your money and your trades has no association with the information presented here. By reading this information you’re agreeing that you hold harmless and no liability to myself, my employer or this website. If that scares you, please click here. In all my trades, I’ve only made a little bit of money with a total amount of trade money equaling under $1000. *update 1/30/21* I’ve now made more than a little money 🙂 Starting in April of last year I funded $2500 into my TD Ameritrade account. Using the principles I have below, AND A LOT OF LUCK, my account has grown to around $13k. This was done with a combination of stocks and options purchases. This may not happen to you, and I’m not saying it will, this post is merely for advice and informational purposes. As you can see, I didn’t become a millionaire in a month. If that’s what you want, head on over to wallstreetbets with your 50k to blow. But I did earn enough for a pretty nice used car or family vacation…
Before you get started, it’s important to know that trading options are essentially gambling; it’s almost pure speculation on whether or not the market or stock will go up or down and your bets will pan out. I say almost because there are traders out there who make a consistent living doing options trading. This article is not for those who already know the in’s and out’s of options trading or are looking for information about advanced options trading strategies (spreads etc). But back to gambling… if you have a tendency to let emotions get control of you if you win or lose, or if you’ll hurt yourself or your family because one of your trades goes the wrong way, then stay out of options trading. I won’t go into all the other investment vehicles you can use to safeguard your money for retirement, and at a bare minimum, don’t even think of trading options if you don’t first have an emergency fund of several thousand dollars.
I work for a brokerage, and I’m in no way endorsing trading of options as a retirement vehicle. If you trade options, you may lose everything you have in your bank in one week if you’re not careful. Trading options can be stressful and painful when things don’t go your way. You really do have to watch your puts and calls pretty much every minute of the day while your trades are active. But on the flip side, if you are frugal and learn as much as you can, trading options can be a nice way to generate money quickly without too much physical work. Options trading really is just for “play” money; I advocate putting 99% of your money into a Roth IRA or 401K.
Now onto the eighteen things I’ve learned trading options. I, myself, read my list EVERY TIME I’M ABOUT TO PUT IN AN OPTIONS ORDER. I’ve probably canceled a dozen trades after I’ve read my own list just because I’ve let emotions get hold of me and this list brings me back to reality. This list isn’t necessarily in order of importance.
Limit your losses (always) – Decide how much your bottom limit is and stick to it. If I ever let another option expire worthlessly, I’m worthless. It’s my money. Always keep enough in the brokerage account to at least place a couple more orders. When you have to add money to your brokerage account from savings to keep trading, you’re losing.
Don’t buy options for smaller companies, stocks, or obscure ETFs based on hunches or charts. Smaller stocks sometimes don’t have the volumes and there will be no one around to buy your Out-of-the-Money option if the market is heading the wrong direction. They often have fewer price points and options in the option chains.
If you win (your option hits its price target), you’ll probably be up a good amount, so sell when the trend is favorable. You’ll never know what will happen in the next few hours or days. DISCIPLINE! Some news might hit, the president will tweet about China, or a scandal could erupt, and everything goes down or vice-versa.
You’ll never time the sale of an In-the-money option exactly at the peak price of the day so it’s ok to sell after it’s coming down from the intra-day high. Better to make some money on the drop from the high than to wait for it to get back to the peak.
It’s ok to sell for a $5, $10, or $20 profit if you’re In The Money and not feeling it and the trend changes or news hits.
The whole reason you’re doing this is to make money whether or not the market is Rising or Falling. Don’t get emotional about what you want to happen to the market or company. Only go by the numbers and make money off of the trend, whether it’s a Call or a Put.
Don’t let an option ride overnight especially if your option is expiring soon. After-market trading is a good way to lose a lot of money real quick once the market opens. You need your sleep and you don’t like to wake up early. This is not set in stone because you could be betting on a piece of big after-hours news or earnings. Also, if you have more money, you can purchase more expensive options that expire in a few months, which is absolutely better than buying a weekly that expires in a few days. This takes the ease off of after-hours fluctuations.
Sometimes stocks are so beaten up, some more bad news just clears the way for a rally because there isn’t any reason to punish the stock further.
Same with good news, a stock could be so bid-up that more good news essentially causes a ceiling and there is no reason for it to go up more because it is already so priced for perfection so it goes down.
In a bad market, bulls want red openings and bears want green openings. In a bad market, bulls will buy low right? And in a bad market bears will fade a gap (short).
Keep a good positive mindset and just keep hitting singles for $20, $30, $50, whatever, and keep the loser mentality away.
It sucks you can only do 4 same-day trades in 5 days (with Robinhood,) but don’t allow that fact make you ride an option longer than its value. Theta will steal your money anyway so stick to day trades with options. If you have a long-term bet then buy the actual stock, or buy an expensive option that expires in a few months/year.
Implied Volatility (IV) – when looking to buy an option, look at the Implied Volatility. If it is something high like 91%, then you can probably expect to see the value of your options (most likely) swing/drop 91% during the term of your option. Options are not the best vehicle during earnings. It’s best to sell and make any profit you can before earnings come out. I YOLO bought $375 worth of SBUX options on Thursday with IV of 91% which expired the next day (Friday.) The option made almost no money on Thursday, then favorable earnings came out that Thurs night. The stock jumped up a little in after-hours trading then went back down again. The next morning it dropped like a rock 91 %. I got out that morning and lost $300. Then later that day, like not even 2 hours later, the stock went back up to its previous close. See the chart below. I could have just held on through the IV and not lost as much, but it takes real guts to hold in that situation, which you don’t want to go through, believe me. Again, holding options through earnings is very risky unless it’s something like MSFT which beat it’s projected earnings by a lot and IV was low. Place your bet either prior to or after the earnings and then watch the market reaction. Because this option was expiring the same day, theta was going to quickly eat into its value even if I held during the rise after the sharp drop. IV I’m not entirely sure about, so comment if you know more about this below.
No “options guru tweet” nor r/wallstreetbets post will give you a winning trade every time. Trust your own instincts, gather as much information and news as you can, and find out what works for you, not someone else.
In general it’s better to buy “natural” monthly options with non-weekly strike dates. For some reason, the weeklies don’t tend to do as well.
In general, it’s better to buy an option with an expiration a few months out. Yes the option you’re buying on a Tuesday has better “YOLO” returns if it expires on Friday, but just the same, you have a bigger chance of losing everything very quickly. At least with an option a few months out, you can hold through a few dips without too much consequence, and then if a big pop occurs you can capitalize on it. Again, discipline. If you get a pop on an option, even if it expires in say, 2 months, cash out and bank the money. I’ve never regretted taking a big earnings pop and banking it. More often than not, the next couple days/weeks, the stock returns to it’s previous trend. The point is, you don’t know what the stock will do. Take your gains and get out. Then sit with your cash in your account, smile, take a breath, do your research again, and wait for the next opportunity.
TD Ameritrade is my broker of choice now, and although I’ve got a little money in Robinhood, it’s practices lately are forcing me to close my Robinhood account. FYI, you don’t have to sell your securities in Robinhood in order to put them in a different brokerage, you can transfer. There is a $75 fee associated with the transfer, so it may or may not make more sense to sell your securities and just pull the money out or the transfer may make more sense if there are tax ramifications.
Aside from Options, now that I have more cash in my account, I’ve done pretty well with “lots” of stocks. By “lots” I mean purchasing lower priced stocks in quantities of 100 shares. That way if the price goes up 1 point, I know I’ve made $100 on that stock that day. Just because they are shares, doesn’t mean I have to hold on to them for a longer period of time. There are better tax advantages when you hold on to a stock for at least one year, but I use the same principles above and sell and bank stock gains the same as I do options.
That’s it for now! I hope some of the information was valuable, and I wish you an exciting and profitable foray into the world of trading options.
Recently a client complained that an Office 365 account had sent out spam messages to a number of clients. Later, the suspect account which had been sending spam could no longer send or receive email. However upon first glance at the mailbox, sent messages were sitting in the sent items folder, and messages sent to the account in question were not receiving bounce-back failures, but the messages sent to the affected account were not in the inbox. After we changed the password to the account, and enabled 2FA on the account we could still not send and receive mail. Below are the steps used to resolve this particular issue. In short, a malicious inbox rule had been created and outbound messages had been blocked by Microsoft.
Log into the tenant’s Admin console with an Administrative account, and change the password of the affected account.
Log into the affected account as the user using the new password.
Click on the Gear icon and then under Your app settings, click Mail.
4. One in the Mail app Settings, go to Mail > Automatic Processing > Inbox and Sweep rules.
Here we can see a malicious rule had been created to mark all inbound mail as Read and move the message to the “RSS Subscriptions” folder:
5. Uncheck and turn off any malicious or invalid rules.
Also check for any new forwarding rules in Mail > Accounts > Forwarding:
6. When we look in our “RSS Subscriptions” folder we find some messages from Microsoft indicating the account has been blocked from sending mail because the account was flagged as sending spam:
Your message couldn't be delivered because you weren't recognized as a valid sender. The most common reason for this is that your email address is suspected of sending spam and it's no longer allowed to send messages outside of your organization. Contact your email admin for assistance.
Remote Server returned '550 5.1.8 Access denied, bad outbound sender. For more information please go to http://go.microsoft.com/fwlink/?LinkId=875724. S(9333) [DM5PR10MB1914.namprd10.prod.outlook.com]'
7. To resolve this issue, we’ll need to go into the Action Center. Log into the Admin console > Admin Centers > Exchange > Protection > Action Center
8. In the Action center, we’ll find an issue flagged regarding our hacked user account. Take action on the issue and after a while due to permission propagation, it may take up to 2 hours for the account to be re-enabled for sending mail again.
9. It might be a good idea to contact Microsoft Support if you continue to experience problems with a user account sending spam. Changing the password should prevent malicious access. Most like the account had been phished or the computer the user has was compromised by a virus/malware or spyware. It’s recommended that the account have two-factor authentication or multi-factor authentication enabled to prevent the account from being hacked again.
tag: outlook cannot send or receive email but sent mail is in sent items folder
When trying to setup and authenticate to an AWS Instance running OpenVPN, a user could not complete a new connection to OpenVPN after entering the initial un/pwd. They receive the error: Permission denied. This is after successfully setting up the OpenVPN client on Windows 10 and scanning an Authenticator code using Google Authenticator App on a Samsung S8 Active Android mobile phone running Android 8.0.0 ‘lollipop’. Ultimately the reason the user could not authenticate was their mobile phone’s time was off by about 3 minutes. Continue below to find additional information on how to troubleshoot this and other authentication issues with OpenVPN.
When troubleshooting OpenVPN login errors it’s a good idea to first try some of the following:
Unlock a Disabled or Locked account on OpenVPN Admin console
To check for the events related to a user lockout, first log into the Admin web console > Status > Log Reports. Here you will find the errors related to bad authentication and eventually an account lockout.
The errors you may find could be the following:
Google Authenticator Code is incorrect.
LOCKOUT: user temporarily locked out due to multiple authentication failures.
To unlock a user account (if using local authentication), Login to the Admin Web Console, Go to “General” under Authentication and change Authentication to “PAM”, Save Settings > Update Running Server > “Local” > Save Settings> Update Running Server.
This procedure should unlock disabled or locked user accounts on OpenVPN.
Reset A User Account on OpenVPN
To reset a user’s OpenVPN account:
Log in to the admin web console, click on User Permissions.
Find the username, place a checkmark in the Delete column, then Apply > Save. Next, re-create the account. Scroll to the bottom of the list, type the new user name: Eg. jcoltrin Save > update server
Go back find the username again in the list and hit Show:
In the admin web console, under the Configuration menu, click License. Check to ensure that your concurrent users have not reached or exceeded the limits of your licenses (under At a glance,) or that your licenses have not expired.
Use SSH to check the logs of the OpenVPN server and get the specific errors for an individual’s login problems.
After logging into the server using Putty/SSH, you can change directory to the scripts directory:
cd
/usr/local/openvpn_as/scripts/
and then issue the command ./authcli –user <username> –pass [email protected]
This will produce something similar to the following information:
Result:
API METHOD: authenticate
AUTH_RETURN
status : COM_FAULT
reason : An error occurred while connecting: 13: Permission denied. (twisted.internet.error.ConnectError)
user : jcoltrin
Addtionally you can find more messages related to authentication failures in /var/log. You’ll find these messages in the latest log files:
openvpnas.log
openvpnas.log.1
Use your favorite editor (vi) to search through the logs
vi openvpnas.log
use the command / and then the username to search for that term and hit “n” to go to the next instance of your term, for example:
/jcoltrin > n > n
and then :q to quit.
Here are some typical error messages for my authentication errors:
2019-02-26
14:20:08-0800 [-] WEB OUT: '2019-02-26 14:20:08-0800
[UDSProxyQueryProtocol,client] Web login failed
(twisted.cred.error.UnauthorizedLogin)'
2019-02-26 14:21:30-0800 [-] WEB OUT: "2019-02-26 14:21:30-0800 [UDSProxyQueryProtocol,client] Web login authentication failed: {'status': 1, 'client_reason': 'LOCKOUT: user temporarily locked out due to multiple authentication failures', 'reason': 'LOCKOUT: user temporarily locked out due to multiple authentication failures', 'user': 'jcoltrin'}"
Make sure the phone with Google Authenticator has the correct time and set the phone to sync it’s clock with the network/carrier
As mentioned at the beginning of this article, what the original login issue came down to was the Android phone, on which the Google Authenticator was running, had it’s time off by about 3 minutes. To set and change the correct time on an Android Galaxy S8 Active, first, go to Settings > General Management > Date and Time > Set/Turn on Automatic Date and Time.
I’m not sure why the value for this phone had it’s time set to not have automatic sync with the network/carrier. This may have been due to a recent android update because I found this setting off on a couple phones in the office. Ensure the time on your server is accurate as well by issuing the bash/ssh command:
After having created a Resource Room in the Office365 Admin console (with an Enterprise E1 license,) you may find that meetings which are created in Outlook and which are sent, are not automatically processing and sending verification confirmations back to the person that created the event. Nor will new events populate the event in the new room’s Outlook calendar. In this case, there are a few things we can check to ensure the room behaves as intended.
First, after creating the room, ensure that you, as an admin, are set as an owner of the room. Under O365 > Admin Center > Rooms and Resources > place a checkmark next to the room in question. Ensure that Allow repeating meetings and Automatic Processing is On. Then, click on Edit Exchange Settings:
2. In this example, we don’t use booking delegates. In the Exchange Settings for the new resource room, make sure Booking requests are accepted automatically.
3. Edit the booking options, contact information, email address, and mailtip settings to your preferences and then click on Mailbox Delegation. Here, add yourself under Full Access so that we can go on to our next step.
4. Next, log into your own OWA admin Outlook online inbox. In Outlook, click your profile photo in the upper right corner and click “Open another mailbox.” Type the address of the room and open the webmail for the room.
5. Here you may see some emails of previous attempts to book events like the following with the error “Your calendar couldn’t be checked to see whether this event conflicts with other events.“:
6. This error lets us know that automatic processing is not working even though we have it set to “On” in our first step. Had the processing worked correctly, we wouldn’t even see this event email in the mailbox of the room in question.
7. In the upper right corner, click the Gear icon, then under Your app settings, click Calendar.
8. In the calendar resource scheduling settings, ensure that under the scheduling options, “Automatically process event invitations and cancellations” is checked, and then click Save.
9. In theory, these settings should be enough to get the calendar to auto process and verify, however, your results may vary. Test by creating a meeting event in outlook with the new room. When you send the meeting, you should receive a verification email in your inbox in less than a minute. If you don’t receive the verification, check the inbox of the calendar again. You’ll probably find more emails with the “Your calendar couldn’t be checked…” errors.
10. Time to open PowerShell and connect to your O365 Exchange. If you’ve enabled MFA (two-factor authentication) use the guide on how to connect to Exchange with Hybrid/Modern Authentication here. If you don’t use Modern 2FA authentication, use the following commands:
12. It’s helpful to first get a list of all calendar processing objects of a room that already works correctly to refer to when editing your new room’s permissions. If you don’t already have a room that you can reference, below is a list of my room that is not behaving normally:
13. Notice that ProcessExternalMeetingMessages is set to False. Let’s change this to True with the following command:
14. After making this and a few other changes displayed in the following screenshot, go ahead and try creating another test meeting and see if the autoprocessing behaves as it should. If you’re still having trouble, try referring to the screenshot below as an example, and use the “Set-CalendarProcessing” command to edit the values.
15. Once you successfully receive verifications and the calendar populates with events as it should, you may want to set the calendar to display the owner of the event and details of the event (rather than the event is listed in the calendar as only “Busy”.) To do so, follow the instructions I wrote in my article here.
Occasionally we’ll be required to set a user account on Office365 to never expire. It’s not advisable to perform this action, as a compromised account who’s passwords never expires can be a liability. However, in some cases a utility account such as a scanner/copier or kiosk account may require a password that does not change. The following tutorial will show you how to set an Office365 password to never expire using PowerShell.
First, we’ll want to ensure that the account password is not already set to expire and we want to confirm it’s status. Using PowerShell we can get information about an Office365 user account password expiration status.
1. Connect to Microsoft Online Services with PowerShell by running the following commands:
Import-Module MSOnline
Connect-MsolService
2. Next, replace <UserID> with the user account (email address) of the user’s properties we want to get with the following command:
3. Because we get the message returned that the property PasswordNeverExpires = False, we want set it to $True and set the account password to never expire with the following command:
Because our PasswordNeverExpires property is now set to True, our task is complete. Disconnect from Office365 and close powershell by entering the command: exit.
When attempting to move files in SharePoint Online Office365 from one folder to another you may find that you get errors or the moving process times out or fails with the error:
Error: We couldn't move the file because it's locked for editing or has been modified or deleted.
What has happened is some of the files in these folders have been marked as “checked out” or “locked”. This may have been done erroneously by a user or the status was corrupted when the files were originally uploaded into SharePoint.
Once the files are checked in, you can move them. As an alternative to moving the files, you may also be able to “Copy To…”, and then delete the original files. Again, you may not be able to delete the files you copied because the files you want to delete in SharePoint may also be locked or checked-out.
This is what worked for me:
Use your favorite web browser and log into your SharePoint site (e.g. https://companyname.sharepoint.com/sites/sitename.
Browse to the problem folders that contain files that you cannot move to another folder.
In the folders, you should find files that are “checked out”. The files will have a green arrow icon next to the file icon.
Place a checkmark next to the file that is checked out.
In the menu at the top-right choose “…”
In the “…” menu, click “Discard check out”
Now try moving the file with the following sequence:
If the problem files are Word/Excel files, you may need to Open the files in Word or Excel first, in order to check them back in.
At some point, a user’s mailbox will reach the default quota for Enterprise E1 default of 50 GB, and they will have to either move mail into an archive or delete mail to continue to receive email. The user may receive the warning:
Your mailbox is near the maximum storage limit. Archive or delete items to create additional free space.
Our options at this point is to do one of three things: Upgrade the user’s license from E1 to E3 to double the mailbox size, permanently delete mail out of the mailbox, or archive the mail. Microsoft provides 50 additional GB of archive space for an E1 license (this number is subject to change.)
In many instances, the user may not want to delete any mail and would prefer to archive the mail. In my opinion, the ideal way to handle archiving is to create an online archive, rather than create .pst files on the local machine which could end up getting lost or deleted. Also managing local .pst archive files can be a pain. And lastly, if the archive is only available as a .pst file in the user’s PC, the archived mail will not be available from webmail or a different device.
If we want to create an online archive for the user on Office 365, there are a few simple steps to take in the Office 365 Admin console.
Log into the Office365 Admin console, then click on Admin centers > Security and Compliance:
Next, on the navigation bar, expand Data Governance, and click Archive
Now on the right-hand pane, we will see all of our mailboxes and find out if the Archive Mailbox for Office 365 is enabled or disabled.
To enable the archive on a disabled user’s mailbox, first select the user. If we have a lot of users, do a search for the user’s name and then highlight the correct mailbox we want to change.
We can see in the screenshot above, my account already has Archive mailbox: enabled. If the account’s archive had been disabled, we would simply click the Enable link. When we click enable, we will get the following Warning:
If you enable this person's archive mailbox, items in their mailbox that are older than two years will be moved to the new archive. Are you sure you want to enable this archive mailbox? Yes No
9. Click Yes.
10. What happens next is, as the warning states, mail that is over 2 years old will begin to be archived. We will also get some new features in both Outlook online, as well as in Outlook 2016/Outlook 2013. We can wait for the auto-archiving to take place, but we can also take some immediate action to archive old mail online.
11. Pretty much immediately in Outlook online, we will get new Archive buttons, and an archive folder here:
We won’t see the archive buttons until we click on an individual message. If we do click on a message and select it, we will see the Archive button available.
12. We can also select multiple emails and then right-click on the highlighted messages. A wizard will appear on the screen. Click the Archive button to move these emails to the archive folder.
13. If reducing the size of the mailbox immediately is our goal, we can start by archiving our largest emails first. At the top of the mail folder, whether it be the inbox, Sent Items, or Deleted Items folder, we’d click the Filter button > Sort by > Size.
14. Select the “Enormous” items first by clicking on the top email, hold down the Shift button, then select the bottom email and it will highlight all of the messages in between. Next, right-click and choose Archive.
15. In the desktop version of Outlook 2013/2016, only after a few hours will we have our new Archive folder available. This may take up to 24 hours depending on the speed of replication of settings from Office 365 down to the client. Once the folder is available, however, I find the process of moving mail out of the inbox, sent items or cut/paste of subfolders into the archive much easier.
I don’t have mail over 2 years old in my mailbox, so I’m not sure if it will automatically create subfolders dependent on where they originally lived so let me know in the comments if you notice automatic folder creation.
In order for someone to find an old message, they will only need to search their mailbox in Outlook online or Search Archive in Outlook 2013/2016.
On Office365 SharePoint, when trying to open a file in the Windows File Explorer, you might get something similar to the following error:
An error occurred while reconnecting Z: to (sharepoint location) - Web Client Network: Access Denied. Before opening files in this location you must first add the web site to your trusted sites list, browse to the web site, and select the option to login automatically. The connection has not been restored.
….or clicking the Open With Explorer button does nothing, or the button is greyed out.
If the button is greyed out using Windows 10 Edge, you might find things work better using the Internet Explorer web browser. Edge does not support Active X controls. So instead, Click on the the Start button, type in Internet Explorer, find and open Internet Explorer (11), and try again.
To get to the Open in Explorer button.
Log into https://portal.office.com
Click on your apps menu and choose SharePoint
Browse to a document library > Documents
In the bottom left corner of the browser click the “Return to classic SharePoint”
Place a check mark next to a folder, click on the “Library” tab at the top of the screen, and then click “Open in Explorer”
To resolve, make sure you have the following:
Windows 10 is up to date (v1803) as of this article
The Webclient service is Started and set to Automatic (Start > services.msc )
Make sure the following sites are added to your Trusted Sites in Internet Explorer settings:
https://yourdomain-files.sharepoint.com
https://*.sharepoint.com
https://login.microsoft.com
https://portal.office.com
https://yourdomain-myfiles.sharepoint.com
Next, restart your IE web browser, open IE, log into Office 365, and try again.
It may be beneficial to reset IE to its default settings:
IE > Gear Menu > Internet Options > Advanced Tab > Reset (delete personal settings) – use caution, try the following first, then if still having issues, try resetting your browser.
