Event ID 4776 logging onto imap

Question

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

Answer 1

Hi，
Thank you for posting in our forum

If the user is confirmed to exist, the problem will be a bit complicated

According to my knowledge and experience, an exception occurred during ldap query.

So now a better solution should be to enable netlogon and monitor for a period of time

Hope this information can help you

Best wishes
Vicky

Answer 2

Hi，
How are things going? Could you please send me an update so that we can continue to work on this problem and resolve it? Thanks for your help.
Best wishes
Vicky

Answer 3

Hi,

Just checking in to see if the information provided was helpful.

Please let us know if you would like further assistance.

Best Regards,
Vicky