We have an application trying to log onto our Exchange server using imap. we are getting this event:
Event ID 4776
The computer attempted to validate the credentials for an account.
Authentication Package: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Logon Account: XXXXXXX
Source Workstation: XXXX
Error Code: 0xC0000064
Where 0xC0000064 seems to means "user name does not exist"
But the user does exist and have a mailbox.
Any suggestions on how to troubleshoot this?
Thanks,
Rich