Hi, In our company we have multiple domain controllers (like dc-01, dc-02, and dc-03), and large SharePoint FARM. Our system engineers bring down one of the domain controller (ex: dc-03) to do some maintenance task. After that, in SharePoint FARM, we are getting database connectivity errors in eventviewer from one of the WFE. When we bring back the domain controller, WFE starts working. How do we resolve this? How do we identify, is there any services depends on that particular domain controller? Regards, Prakashwww.aristonsoft.com - .net 3.5 hosting provider in India

It depends on the roles the Domain Controller contains and the DNS settings of your SharePoint Farm. The most likely cause If DC3 hosted DNS and your SharePoint servers were not configured for a second DNS server or unable to resolve the SQL Server Address from the secondary server.. Check to ensure that your DNS servers are configured and available. Then use NSLookup to see if they can resolve your SQL Server Name, use NSLookup Server Name YourDNSServer to set which DNS Server is used for name resolution.. NSLookup http://support.microsoft.com/kb/200525 -IvanIvan Sanders My LinkedIn Profile, My Blog, @iasanders.

As Ivan said, sounds like a DNS issue. I would check the IP Configuration on that WFE (look at primary and secondary DNS) to see if it matches the other, healthy servers. Troy Lanphier http://blog.sharepointcookbook.com

Hi Ivan/Troy, You are right. It is a DNS issue. Once we updated the correct IP on DNS configuration on particular WFE, everything is fine. Thanks for your help. Regards, Prakashwww.aristonsoft.com - .net 3.5 hosting provider in India