Temporary Block - Login Access Denied

Document ID : KB000121528
Last Modified Date : 26/11/2018
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Question:
Using AWA, User experiences an authorization error when attempting to log in:

U00003234 Logon error: Access denied. 

If User waits approximately 10 minutes, log in is then successful.
Environment:
Any with domain controllers for authentication. 
Noted on Automation Engine version:

12.0.4+build.1483

This issue is not specific to the AE version, however. 
Answer:
All domain controllers were rebooted, which resolved the issue in this case. The command:

true | openssl s_client -connect maindcXXX.main.ad.xxx.xx:636 | openssl x509 -noout -text | grep DNS

done against all controllers report back the correct information. No issues logging in have been reported after reboot. 
Additional Information:
If the issue presents afterwards, please contact Support/open a ticket for assistance with troubleshooting/tracing this issue.