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Getting multiple event id 4776 messages after upgrading to 2008 r2 DC'S with 2003 dc's present

Posted on 2011-09-16
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Last Modified: 2012-05-12
getting the event below. i think this is also causing accounts to lock out.

WS1100 is the sophos proxy appliace used for internet access.


The computer attempted to validate the credentials for an account.

Authentication Package:      MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
Logon Account:      
Source Workstation:      \\WS1100
Error Code:      0xc0000064
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Question by:Nsingh007
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Author Comment

by:Nsingh007
ID: 36548560
also these accounts are locking out SystemMailbox{3BA7A037-C31E-46FE-B9DF-C23999926655}, SMEX_BECZAPE101_MB
iwam , iusr
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by:rpassero
ID: 36549408
C0000064 = invalid username

Check your proxy config, is it possible there something configured on your proxy server attempting to authenticate to your domain with a user that doesn't exist?
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Nsingh007 earned 0 total points
ID: 36558705
problem was on the sophos proxy , had to re sync
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Author Closing Comment

by:Nsingh007
ID: 37913786
consulted with the Sophos experts
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