Windows Server 2016 - DNS/AD problem

[rzammit82]

Windows Server 2016 - DNS/AD problem

Hi all - at one point our DC froze and we had to do a restart. It installed a lot of updates and then once it got up and running again we started experiencing problems with DNS, passwords, mapped drives etc - please refer to screenshots. Its as if the communication between the desktops and the server got out of sync somehow.

Screenshots:

https://files.engineering.com/getfi...1-8703-4a54-ae47-6ab90145e66a&file=error1.png

https://files.engineering.com/getfi...6-ed13-4938-8d2b-49fb944123aa&file=error2.png

Any idea what we can do please?

Thank you

 

[suncit]

Hi again i discovered that this seems to be an AD issue through event viewer:

The Security System has detected a downgrade attempt when contacting the 3-part SPN

ldap/JUPITERDC01.jupiter.local/jupiter.local@JUPITER.LOCAL

with error code "The attempted logon is invalid. This is either due to a bad username or authentication information.
(0xc000006d)". Authentication was denied.

​Any ideas??