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Event ID: 8003 Source: Browser
As per Microsoft: "The subnet mask of the Windows 2000 client computer is incorrect or is different from the primary domain controller. The client computer has attempted to promote itself to the master browser of the subnet and has failed because only one computer in a domain can be running as the master browser". See MSW2KDB for additional information about this event.
ME188305 provides information on troubleshooting the Microsoft Computer Browser Service.
To Fix: Change the TCP/IP protocol configuration to the correct subnet mask. See ME143153 and Microsoft Messages links.
This can also be caused when routers or switches are misconfigured and propagate UDP port 137 and 138 broadcasts. In this case large numbers of event 8003 appear in the event log. Also check ME190930 for more information.
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