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Network switch with full-duplex incompatible with half-duplex network interface cards (NICs)
Article ID: 224131 - View products that this article applies to.
This article was previously published under Q224131
Clients cannot log on to the domain controllers. Additional NetBIOS traffic problems are:
Event ID: 8003
Description: The master browser has received a server announcement from the Windows NT client that believes that it is the master browser for the domain on transport (NetBT). The master browser is stopping or an election is being forced.
The client computer is located in a different subnet, and UDP 137 and 138 broadcasts are not being forwarded.
Event ID: 8003
Description: The master browser has received a server announcement from the <computer_name> that believes that it is the master browser for the domain on transport (NetBT). The master browser is stopping or an election is being forced."
This problem occurs when network logon validation is prevented over a network switch.
The network switch prevents the server from authenticating the client. The two-way communication session necessary for logon validation is prevented. The Windows-based client computer that cannot successfully communicate with the Windows-based server acting as the subnet master browser may cause a browser election, which causes the event ID 8003 error to be registered on the PDC.
Network switches and server network interface cards (NICs) have to have the duplex settings matched for NetBIOS communication to function properly. Both need to be either full-duplex or half-duplex, but they cannot be mismatched.
Browser elections resolution: Some OEM FDDI adapters configured for full-duplex might be incompatible with some network switches. When the OEM FDDI cards were replaced with full-duplex cards, the browsing elections went away.
Article ID: 224131 - Last Review: January 21, 2008 - Revision: 2.0