I am in need of assistance. I have spent days now looking everywhere for the root cause of this and what can be done to correct it. This started showing up about 11 days ago in the Mail Server Event Viewer. Nothing I have found in the Knowledge Base Articles, or any blogs, forums, info exchange sites, etc. has helped. I would love to get this problem corrected as we are starting to plan ourmigration to 2007 and we will not start to do that until the errors are corrected on the current server. Anyone with any ideas that is willing to offer them up would be greatly appreciated. Thanks, Dave This is the error we get just about every 7 minutes in the event log... Event Type:ErrorEvent Source:MSExchangeDSAccessEvent Category:LDAP Event ID:2061Date:9/25/2007Time:10:09:07 AMUser:N/AComputer:MAILSRV35Description:Process MAD.EXE (PID=2476). An LDAP search call failed - Server=MAILSRV1.DOMAIN.com Error code=80040957. Base DN=, Filter=(legacyExchangeDN=), Scope=2. For more information, click http://www.microsoft.com/contentredirect.asp. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Hope this helps: http://www.eventid.net/display.asp?eventid=2061&eventno=1784&source=MSExchangeDSAccess&phase=1

Thanks for replying to the post. Unfortunately I have tried all that stuff and it still makes no difference. I am about to place that call to MS and see if they can fix it. After that, Iwill be back on to post the update so that anyone else running into this wil have another thing to try. Thanks a lot for your help though, it is really appreciated...

I am experiencing the same problem. The event id occurs when I try to connect Outlook with the Exchange server, which is not successful. OWA works fine. Any updates from MS on this case?

I too have this and am experiencing issues with offline address books as a result. Really need help on this if anyone has got a reply from MS yet...

OK, solved problem in my case. A lot of forums hinted to the Directory Access tab in server properties in Exchange System Manager. The auto configuration appeard to be OK, but i deleted all auto configuration, defined servers manually, and then switched back to auto. The configuration showed the same as before, but the error disappeared. It may have been caused by earlier DNS problems(?) Configuration in Directory Access tab: DC1 config(auto)DC1 DC(auto)DC2 DC(auto)DC1 GC(auto)DC2 GC(auto) In addition, Authenticated Users rights was removed from Default Global Address List, which lead to Outlook failing to resolve the user name. I used Network Monitor which clearly showed RPC requests from Outlook and the responses from the Exchange Server. The request for Global Address List was responded with an empty list. Sorry I don't have an example to put in, but I recommend having a try with Network Monitor.