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Getting two different sub-status codes on same username in Exchange Server

YahyaBatla 0 Reputation points
2023-01-17T11:18:44.7966667+00:00

Hello!
During monitoring of Exchange Server logs I found that multiple login failure attempts were made by existing valid users on exchange server having event ID 4625 with two different sub-status codes:

 

  1. 0xC0000064 ( Username does not exist )
  2. 0xC000006A ( user name is correct but the password is wrong )

 

I know the user does exist, there's no typing mistake in the username but it still shows sub-status code 0xC0000064 and in some events it shows 0xC000006A ( which could be normal because of user typing  wrong password ).
Did anyone face any similar situation? Does anybody know what could be the possible reason?
TIA

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