Hello, I have a problem which youve probably heard a lot of master browser I keep getting error MRxSmb event ID 8003. Before deciding to ask for any ideas I spent day googling and trying to solve it. What I did: 1. I switched the computer browser service on PC which belived that it was the master browser but few minutes after I get the same error but from another PC (random). 2. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\Browser\Parameters\IsDomainMaster to TRUE no joy still getting the same error. 3. Restarted DC. 4. Additional info: there are 3 subnets in our network, WINS server (running on DC), there are many laptops machines (so wireless and Ethernet cards..). No joy I keep getting the same errors in DC log. I used browstat: 1. browstat.exe status: ------------------------------------------------------------------------------------------------------ Status for domain UTT on transport \Device\NetBT_Tcpip_{ED0EF83B-C300-450C-9DE1- 83F51F365392} Browsing is active on domain. Master browser name is: UTT-DC1 Master browser is running build 3790 3 backup servers retrieved from master UTT-DC1 \\UTT-FS0 \\UTT-DC1 \\UTT-FS04 There are 148 servers in domain UTT on transport \Device\NetBT_Tcpip_{ED0EF8 3B-C300-450C-9DE1-83F51F365392} There are 1 domains in domain UTT on transport \Device\NetBT_Tcpip_{ED0EF83B -C300-450C-9DE1-83F51F365392} ------------------------------------------------------------------------------------------------------- The backup servers seems to be changing quite often I dont know if it should be like that. 2. What worries me if I use command browstat status \\UTT-DC1 I do not get a response: ------------------------------------------------------------------------------------------------------- C:\>Browstat.exe status \\UTT-DC1 Status for domain \\utt-dc1 on transport \Device\NetBT_Tcpip_{ED0EF83B-C300-450C- 9DE1-83F51F365392} Browsing is NOT active on domain. Master name cannot be determined from GetAdapterStatus. ------------------------------------------------------------------------------------------------------- Any ideas what shall I do? Ive read that I can use GP to switch off Computer Browser service on all PC. Shall I go for this option? What happens if there is no computer on different subnetwork with Computer Browser running will I still be able to use all PCs in My Network Places? Sorry for such a long post but I wanted to put as many details as possible. Thank you for your help. Marcin.

hi there, computer browser / populating the computers in network neighborhood should be done automatically , please do not tweak any registry such as changing isdomainmaster .what i suspect is that there is additional server that wants to participate in the election . can you switch off the computer browser service and check a) if you get any error related to computer browser / mrxsmb.b) if there is a functionality change.Few Pointsa) if you have multiple subnets participating in elections , make sure routers are not forwarding UDP broadcastsb) try disabling and enablign the NIC c) make sure you are not running multihomed DC I would like you to go through the link which is a troubleshooting guide for computer browser relative errors. http://support.microsoft.com/default.aspx/kb/188305sainath !analyze

Hi, thanks for your guides. The problem is that I switched off the computer browser on the PC which claimed to be master browser but few minutes after another machine took it place and again I am getting errors. I have not noticed any functionality change after switching the cb service off. Few Points: a) I am pretty sure that we do not forward UDP - but I will double check - we did not this problem in the past so there is small possibility that it's caused by that. b) I rebooted the DC - shouldn't it be enough? I can try that. Do you mean NIC on the DC or on the PC which causes problems? c) DC has two NIC but only one connected to the network - just in case I switched off the second NIC. - no joy. d) could you please explain this: C:\>Browstat.exe status \\UTT-DC1 Status for domain \\utt-dc1 on transport \Device\NetBT_Tcpip_{ED0EF83B-C300-450C- 9DE1-83F51F365392} Browsing is NOT active on domain. Master name cannot be determined from GetAdapterStatus. Why I do not get answer from DC1 using this command but everything is fine if I type browstat status UTT - and get response that DC1 is master browser for the domain. I had a look at 188305 yesterday but I will try to follow it again. Maybe I missed sth. Thanks. Marcin.

Hello, I solved the issue. That was caused by UDP broadcast on port 137 and 138. Helpful link: http://support.microsoft.com/default.aspx/kb/190930 On CISCO routers: no ip forward-protocol udp netbios-ns no ip forward-protocol udp netbios-dgm Thanks for you help. Marcin.