We have two Windows Server 2008R2 domain controllers connected over vpn.(Filesvr1(PDC) and Filesvr2) The typical symptoms when the DCs can't talk to each other anymore (at least they can't talk completely correctly) -- If you run "dcdiag /v", it will never ever finish or give any error, very odd. I've never seen that anywhere else. You generally can't open \\filesvr1 from filesvr2. You generally can't open \\ualc.org\ualcdocs from filesvr2 (this is the DFS share). Tons of event log error where filesvr1 can't connect via RPC to filesvr2 (or vice versa), so it can't find any DC at the other site, so it can't replicate AD changes or DFS changes. Running "repadmin /showreps" will show lots failures, but it also show the last time it succeeded. Each time it's occurred, which is every week, we've followed the steps in the following KB article http://support.microsoft.com/kb/325850 to temporarily fix the RPC-related issue between the two domain controllers. Checked the switches, checked the cabling. Any ideas out there?

Hi, I would like to confirm what related event errors can you read in Event Viewer? Please verify if the DNS server settings are correct. You may also refer to the following Microsoft KB article to troubleshoot this issue: Troubleshooting RPC Endpoint Mapper errors using the Windows Server 2003 Support Tools from the product CD http://support.microsoft.com/kb/839880 Would you please send me more information for analyzing. For your convenience, I have created a workspace for you. You can upload the information files to the following link. (Please choose "Send Files to Microsoft") Workspace URL: https://sftasia.one.microsoft.com/choosetransfer.aspx?key=8b8bbe00-dc60-4b9f-9a63-721a6d79efa8 Password: H7tW7*q^EwG Note: Due to differences in text formatting with various email clients, the workspace link above may appear to be broken. Please be sure to include all text between '(' and ')' when typing or copying the workspace link into your browser. Meanwhile, please note that files uploaded for more than 72 hours will be deleted automatically. Please ensure to notify me timely after you have uploaded the files. Thank you for your understanding. Dcdiag /v /c /d /e /s:dcname >c:\dcdiag.txt repadmin /showrepl dc* /verbose /all /intersite >c:\repl.txt (if more than one DC exists) dnslint /ad /s "DCipaddress" (http://support.microsoft.com/kb/321045) Regards, Arthur Li TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi, I would like to confirm what is the current situation? If there is anything that I can do for you, please do not hesitate to let me know, and I will be happy to help. Regards, Arthur Li TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com .Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.