Install the support tools from your server 2003 cd. Then run netdiag and dcdiag to see what kinds of issues are causing this machine to disconnect from the domain.
Don’t forget to check DNS for any inconsistancies!
As I noted earlier, I have a similar problem. It is very intermittent. I can go for 2 weeks with no problem and then lose the domain every couple of hours for 2 or 3 days.
Here is what I have discovered so far.
1. If you to a cmd prompt on the Exchange Virtual Machine and give the command “ipconfig /flushdns” followed by “ipconfig /registerdns”. That usually restore the connection.
2. If that doesn’t work I go to the DCs (I have 2 of them) and run dcdiag /fix and netdiag /fix. Usually the combination of these commands reconnects everything without rebooting servers.
The errors I get from dcdiag are that all all domain controllers are in use or not responding and LDAP Bind was unsuccessful on directory server.domain.com for distinguished name”
The errors from netdiag are LDAP test failed to query SPN registration on DC,
Can anyone tell me what to do to fix this?