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8003 browsing errors with UDP forwarding

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This article was previously published under Q135464
SYMPTOMS
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.

Data: Words

0000: 00000000 004a0003 00000000 c0001f43
0010: 00000000 00000000 0000055a 00000000
0020: 00000000 00000000
Event log information
Date:6/14/95Event ID:8003
Time:12:12:00 PMSource:Rdr
User:N/AType:Error
Computer:MyPDCCategory:None
CAUSE
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.
RESOLUTION
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.
MORE INFORMATION
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
browsing
Properties

Article ID: 135464 - Last Review: 01/17/2008 19:13:51 - Revision: 3.0

  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional Edition
  • Microsoft Windows 2000 Datacenter Server
  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Server 3.5
  • Microsoft Windows NT Server 3.51
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Workstation 3.1
  • Microsoft Windows NT Workstation 3.5
  • Microsoft Windows NT Workstation 3.51
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows Server 2003, Standard Edition (32-bit x86)
  • Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
  • Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional
  • kbnetwork kbprb KB135464
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