Event ID 4776 logging onto imap

Rich Morrissey 96 Reputation points
2021-05-12T19:00:39.783+00:00

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

Active Directory
Active Directory
A set of directory-based technologies included in Windows Server.
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  1. Vicky Wang 2,636 Reputation points
    2021-05-13T07:21:10.333+00:00

    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

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  2. Vicky Wang 2,636 Reputation points
    2021-05-17T08:49:06.197+00:00

    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

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  3. Vicky Wang 2,636 Reputation points
    2021-05-21T09:34:57.883+00:00

    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

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