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Event ID: 12054 Source: MacSrv

Source
Level
Description
Guest session was timed out and disconnected by the server. The Appletalk address of the Macintosh workstation is in the data.
Comments
 
See ME136300. Also from a newsgroup post: In NT 3.51 and NT 4.0 the timeout value was set too low.  It was set to 45 seconds, it should be 300 seconds. This will keep you from getting this message, worked for me.  Add the following DWORD:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Rdr\Parameters
ConnectMaxTimeout, set this to 300 seconds (decimal) and you shouldn't have any problems.

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