This article was previously published under Q135464
The following error messages are added to the domain controller's Systemlog (as seen with the Event Viewer) approximately every 12 minutes:
The master browser has received a server announcement from the computer MyBDC that believes that it is the master browser for the domain on transport NetBT_NETFLX1. The master browser is stopping or an election is being forced.
Routers on your network are configured to forward UDP broadcasts.
If a Windows domain spans more than one subnet and the TCP/IP protocol(NetBT) is used, each subnet will have a Master Browser. If a MasterBrowser receives server announcements from another computer, claiming tobe a Master Browser, an election is forced to ensure that there is onlyone Master Browser per subnet. These browser elections cause the 8003message to be recorded.
If the routers on the network are configured to forward UDP broadcasts toUDP ports 137 and 138, then the election broadcasts that are intended toremain in the subnet are forwarded to other subnets.
This has also been seen with bridges or switches between two dissimilarnetwork segments within the same subnet.
To stop the 8003 error messages, make sure the routers on the network arenot forwarding UDP broadcasts, keeping browser elections on NetBT local toeach subnet and enable WINS or lmhosts on the network for netbios nameresolution.
Note Switches that are configured for VLAN's (virtual segmentation) have to beconfigured on a per VLAN basis to prevent UDP broadcast propagation.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
190930 UDP broadcast forwarding by Cisco's IP Helper
You can use the Browstat command prompt utility to investigate browsing errors. For more information about browser errors, click the following article number to view the article in the Microsoft Knowledge Base:
188305 Troubleshooting the Microsoft Computer Browser Service