Trust Domain Relationships

Any issues with a computer & domain server relationship can be checked by running in powershell the Test-ComputerSecureChannel command if the result is True then the relationship is fine.

https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.management/test-computersecurechannel?view=powershell-5.1

If false then you need to rejoin the computer to the domain.

Alt key for backslash

To get backslash ( \ ) if the backslash key is not working:

Press keys 9 and 2 while holding down Alt key.

To get frontslash ( / ):

Press keys 4 and 7 while holding down Alt key.