MRxSmb Event 8003

The master browser has received a server announcement from the computer {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.

Cause:
The message usually means that some machine can't see the master browser, so
it tries to force an election. If it is not a client problem, it gets
harder. Is the DC multihomed? This is a known browser problem.
Event ID 8003, 8009 and 8019 Appear If Subnet Mask Incorrect

support.microsoft.com/kb/143153
Event ID 8003, 8009 and 8019 Appear If Subnet Mask Incorrect

SYMPTOMS
A Windows NT primary domain controller (PDC) and a Windows NT client computer reside on the same physical subnet and the same domain. The client computer can connect to a network share on the PDC. In the Windows NT PDC, the following system event appears in Event Viewer:
Event ID: 8003
Description: The master browser has received a server announcement from the computer that believes that it is the master browser for the domain on transport . The master browser is stopping or an election is being forced.
In the Windows NT client computer, the following system events appear in Event Viewer:
Event ID: 8009
Description: The browser was unable to promote itself to master browser. The computer that currently believes it is the master browser is .
Event ID: 8019
Description: The browser was unable to promote itself to master browser. The browser will continue to attempt to promote itself to the master browser, but will no longer log any events in Event Viewer. 

CAUSE
This problem occurs if the subnet mask of the Windows NT client computer is incorrect or different from the PDC. The client computer attempts to promote itself to the master browser of the subnet and fails. RESOLUTION 

To correct this problem, change the TCP/IP protocol configuration to the correct subnet mask.

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www.HowToNetworking.com

Source

Cause: 1. If there is router connecting to two subnets, and it is configured to forward UDP broadcasts to UDP ports 137 and 138, then the election broadcasts that are intended to one subnet may be forwarded to other subnet.

2. If there is a bridges or switches between two dissimilar network segments within the same subnet, you may receive this event ID too.

3. If there is a multihomed computer in the LAN with an incorrect configuration, you may receive this Event.

4. This error can be attributed to one computer has different subnet mask in a network, for example, the subnet mask should be 255.255.255.0 while one computer’s mask is 255.255.0.0. (check this case study, Case Study - Even ID 8003).

5. If a VLAN switch on the network is configured to broadcasts to UDP ports 137 and 138, then the election broadcasts that are intended to remain in the subnet are forwarded to other subnets.

Related Topics

Event ID Troubleshooting

Event ID: 2011 - Not enough server storage is available to process this ... Event ID 5701 - The Netlogon service failed to update the domain trust list ... www.chicagotech.net/wineventid.htm

Troubleshooting computer browsing issues

If you can't disable the Computer Browser service because the compute is the PDC, ... The simple solution is stopping Computer Browser service on the XP. ... www.chicagotech.net/computerbrowsingissues.htm

computer browser

How to force a computer to announce itself to a Master Browser ... How to disable the Computer Browser Service on all Windows clients and servers ... www.howtonetworking.com/Windows/computerbrowser.htm

Computer browser over VPN

Computer browsing over VPN involves routers, multiple segments and multihomed servers. ... Master browser Issues. 5. Permission or Cached Credentials issues ...
www.howtonetworking.com/VPN/browsingovervpn0.htm

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Controlling the Master Browser election