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a database problem is blocking replication on volume

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a database problem is blocking replication on volume

Postby guest » Thu Jul 29, 2010 11:17 am

I have two Server 2003 R2 Standard edition servers. They were replicating for a about a year and then stopped. After running the DFS report I found that I was receiving the followign error: "a database problem is blocking replication on volume" on one of my DFS partners (server1). I followed the directions in http://social.technet.microsoft.com/Forums/en-US/winserverfiles/thread/7599f885-e445-46db-8ead-2ab41af11206 by renaming the dfsrprivate folder. After restarting the DFS replication service I checked the report and Server1 has no errors on it. I'm now receiving the following error on Server2: DFS Replication cannot replicate with partner Server1 due to a communication error. The DFS Replication service used partner DNS name server1.mydomain.local, IP address 10.1.1.5, and WINS address Server1 but failed with error ID: 1753 (There are no more endpoints available from the endpoint mapper.). Event ID: 5002

Does anyone know how I can resolve this?
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Re: a database problem is blocking replication on volume

Postby guest » Thu Jul 29, 2010 11:18 am

Hello nchusker,



From your description, the DFS Replication was failing with the Error ID 1753 (There are no more endpoints available from the endpoint mapper). Meanwhile, you can also see Event ID 5002 in the DFS diagnostic report.



If I have misunderstanding, please feel free to let me know.



Troubleshooting Steps:



1. Please check the all the firewall (including Windows Firewall and other 3rd party firewall among the three servers) to verify that TCP port 135 is not blocked among them. If possible, please turn off the Windows Firewall on both the DFS test servers to check if the error message will re-occur.



2. Please verify that the DFS Replication Service and DFS Namespace Service are Started on both of the DFS server.



3. Please verify that the TCP port that is used by the DFS Replication Service on the replication partner can be accessed.



a. Use rpcdump.exe to verify port 135 connectivity and RPC endpoint connectivity.

b. Use rpcdump.exe to query the endpoint mapper database and the DFS Replication endpoint.



Run the following command in CMD promptup



C:\> rpcdump.exe /s <DFS Replication partner> /v /i > C:\endpoints.txt



If you can see the following error message within the endpoints.txt file, according to the experience, this DFS replication could fail with the error message (There are no more endpoints available from the endpoint mapper) due to the reason that there is a GPO was getting applied "RPC Endpoint Mapper Client Authentication" to these DFS test servers.



When running RPCdump getting error message:

Querying Endpoint Mapper Database...

RPCMgmtEpEltInqNext: (Access is denied)



If this is the case, please run "Gpresult /v > C:\gp.txt" (without quotation mark) with the domain administrator's credential on all these DFS test servers. If there are the following strings in the gp.txt file, this means that the "RPC Endpoint Mapper Client Authentication" has applied to the DFS test servers and can result in DFS replication fail.



Software\Policies\Microsoft\Windows NT\Rpc\EnableAuthEpResolution



You may locate which GPO has been configured with "RPC Endpoint Mapper Client Authentication" in the gp.txt file, and then I suggest that you disable the following corresponding GPO setting within that GPO, or you may totally unlink that GPO.



Computer Configuration\Policies\Administrative Template\System\Remote Procedure Call\RPC Endpoint Mapper Client Authentication



Please note: as this is a computer configuration, we may need to reboot all the DFS test servers to make the modification of the GPO take into effect.



Download the rpcdump.exe from the following link

http://www.microsoft.com/downloads/details.aspx?familyid=9d467a69-57ff-4ae7-96ee-b18c4790cffd&displaylang=en



4. Meanwhile, if the 2 DFS servers are connected with WAN link, this RPC is unavailable error could be also due to the possible black hole router between the 2 servers in the WAN link.



Please follow the Microsoft KB article to see if the issue is related to MTU of the network device.



How to Troubleshoot Black Hole Router Issues

http://support.microsoft.com/default.aspx?scid=kb;EN-US;314825



Recommended TCP/IP settings for WAN links with a MTU size of less than 576

http://support.microsoft.com/kb/900926/en-us



If the problem continues, please collect the latest log files and collect the portqry tool output from each server for further research.



portqry -n problem_server -e 135



You may monitor to see if the DFS replication will be normal with the above troubleshooting steps, if the issue still continues, please refer to the following steps to collect a diagnostic report on the DFS replication.



Create a diagnostic report for DFS Replication

http://technet.microsoft.com/en-us/library/cc778105.aspx



If possible, you may send the diagnostic report to tfwst@microsoft.com for further research.



Hope the information can be helpful.


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