From: Greg Ercolano <erco@(email surpressed)>
Subject: [Q+A] WINDOWS: "Unexpected network error" in 'Frames' report
   Date: Wed, 07 Jul 2010 14:21:57 -0400
Msg# 1950
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>  We've recently been getting these errors intermittently
>  in the 'Frames' report:
>  
>  STATE FRAME TRY HOSTNAME PID  JOBID   [..] NOTES
>  ----- ----- --- -------- ---- -------      ---------------------------------------------------------------------------------------------------------------
>  Fail  0009    1  blade10 3268 svr.457 [..] ERROR: can't create log as rush@blade10:\\jobserver\share1\jobs\BUILDLOG: An unexpected network error occurred.
>  
>  This occurs randomly on different hosts. Our server \\jobserver is a CIFS share
>  on our SAN. Is this a Rush problem, or one with the Windows stack?

        That's a Microsoft error; it seems the OS gave an error when rush
        tried to check to see if the log directory exists.

        Microsoft has a few links for this error; maybe one of them
        will help you discover the problem:
        http://support.microsoft.com/kb/121913
        http://support.microsoft.com/kb/897089

        One non-obvious cause could simply be a DNS problem; when the OS sees the
        UNC path \\jobserver\share1, it has to resolve "jobserver" into an IP address,
        and possibly that hostname resolution is being intermittent.

        How long has this been happening? If it's recent, does its appearance
        coincide with any administrative changes on the server (\\jobserver\share1)
        or network infrastructure?

        When the problem is happening, try walking up to that client (eg. "blade10",
        based on the above error message), and try accessing the "backslash" version
        of that pathname with the DIR command from a DOS window, eg:

dir \\jobserver\share1\jobs\BUILDLOG

        ..if you get the same error, you can probably at least debug it that way.

        If so, I'd probably try 'ping jobserver' first, just to see if the hostname
	lookup is the issue (ie. see if you get a 'jobserver: Hostname lookup failure' error),
        and if not that, probe around with NET USE and friends to see what's up.

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