Is Active Directory Domain services blocking all users?

Question

Active Directory

Hello, help me solve the problem.
Active Directory Domain Services blocks all users at once.
System logs:

Received Kerberos Error:
In login session
Client
Time: Server Time: 4:9:11.0000 2/1/2016 Z
Error Code: 0x7 KDC_ERR_S_PRINCIPAL_UNKNOWN
Extended Error:
Client Realm: Client
Name:
Server Realm: Domain.local
Server Name : cifs/TYAKBW050
Target name: cifs/[email protected] Error
text:
File: 9
Line: f09
Error data in entry data.

And there are a lot of such errors, for each user separately.
I can provide additional information if this is not enough.
"They said it was because of a virus" The server checked the last one with an updated Kaskersky antivirus and Kido Killer "There were options that Kaspersky was blocking, Kaspersky turned off, all blocks were removed for a couple of hours and reappeared even if Kaspersky was turned off.

Answer 1

troubleshooting kerberos problems
We read, carefully check (even if you are sure that this does not apply to your problem) and follow the recommendations.

Answer 2

Time coincides on workstations and the domain controller?