A couple of weeks ago I inherited a 2003 AD domain with a single (NSSERVER) domain controller. I have had plenty to do in other areas and as the domain was running smoothly I had not given it more than a cursory glance .
I was adding few users yesterday. Everything was going fine until I was adding the sixth user and I get an error screen with "There are no more endpoints available from the endpoint mapper".
I clicked ok and then was unable to see the domain in Active Directory Users and Computers. If I did connect to domain controller I could see the domain but if I attempted to do anything other than look I was kicked out again. Users also had problems connecting to shares and everything was generally hosed.
After I rebooted the DC the domain was working correctly again until I attempted to add another user and got the endpoint mapper error and fubared the domain again.
I started checking out the logs to see what I could find and it is not good. Seems there was a second domain controller in the domain named MAIL that disappeared without a trace two years ago. The really bad news is there is a newer server in the domain running exchange that is named MAIL that appears to have never been a DC. The domain has been fruitlessly trying to talk to MAIL for two years and this appears to have finally upset the end point mapper.
Server NSSERVER is listed as the RID, PDC and Infrastructure Master. It is also runs a few applications and is the main file server.
Currently the server MAIL is just hosting exchange and there is one other application server in the domain but it is not nor has never been a domain controller.
It is my understanding that in order to correct the missing MAIL domain controller problem I am going to have to delete and recreate my domain.
I have plans to outsource my email in a few months and I would really love to re-purpose the exchange server to be "the" domain controller and give NSSERVER a break.
Does anyone have any ideas on how I may do a patch job to enable me to add users for a couple of months?
Is there some neat DNS trick I could use?
Some diagnostic files attached for your amusement.