We had a power outtage at one of our three campuses. After the power came on, we started seeing users not able to log in. The Macbooks, couldn't log in with the login window shaking as though it was a bad password. The Macbook users for the most part, are able to log in if they reboot their Macbook. There are not as many Windows PC users on this domain, but they get an actual error message " The trust relationship failed...." I have redacted the domain name and ip addresses to post this. Outside the power outtage, there hasn't been anything changed to have caused this.
Please note, the domain and ip address information was changed in the log below. The rest of the information is directly from a log entry.
Log Name: Security
Date: 11/11/2016 8:42:59 AM
Event ID: 4771
Task Category: Kerberos Authentication Service
Keywords: Audit Failure
Kerberos pre-authentication failed.
Security ID: ACADEMIC\macbookname
Account Name: macbookname
Service Name: krbtgt/domainname.ORG
Client Address: 10.20.30.40
Client Port: 57688
Ticket Options: 0x40000000
Failure Code: 0x18
Pre-Authentication Type: 2
Certificate Issuer Name:
Certificate Serial Number:
Certificate information is only provided if a certificate was used for pre-authentication.
Pre-authentication types, ticket options and failure codes are defined in RFC 4120.
If the ticket was malformed or damaged during transit and could not be decrypted, then many fields in this event might not be present.
<Execution ProcessID="552" ThreadID="6644" />