We had some of our users who were having issues logging in from home after updating their Windows 10 desktops. We use a Remote Desktop Gateway and it was throwing an error saying that they couldn't connect because and error occurred (very helpful).
The big problem we had was that it was random. Someone else who had the same update was able to login without any issues, thus making the issue harder to troubleshoot.
After troubleshooting with one of my users he found this blog post that had the answer.
In short this is what you need to do:
"open regedit and browse to HKLM\SYSTEM\CurrentControlSet\Control\Lsa and look for a DWORD value called LMCompatibilityLevel. If LMCompatibilityLevel is present, and it is set to anything under a value of 3, the user will fail to authenticate to the RD Gateway server. Instruct the user to either change the value to 3, or delete the DWORD entirely. Then reboot the computer and try again."
Once we did that on his computer and rebooted he was able to log back in.
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