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DNS/Active Directory just died

Heres the situation - a brand-new server, brand new W2k3 server install w/ Exchange 2003. Server install goes flawlessly, we being joining PCs to the domain.  One of my techs come to the 2nd machine, tries to add it and fails. It turns out the PC had the same computer name as the server. All other workstations that we have tried to join are now unable to do so.

Error message on PCs:
Logon failure: the target account name is incorrect.

Server event log reports that DNS and active directory are now failing.

Unfortunately, this is all the information I have right now. i don't have remote access to this server until tomorrow.

Any directions you folks can offer would be appreciated.
3 Solutions
Joseph NyaemaIT ConsultantCommented:
DNS and active directory failing is quite a broad description...
Is the DNS service running?
Active directory relies heavily on DNS.
So DNS settings have to be correct first.

ON the server right click my network places icon on the desktop.
Right click on the local area connection
select properties
double click TCP/IP settings.
Make sure you are using a static IP.
Remove all references to DNS and WINS servers
(We are sorting DNS communication first)

Do the same for the other adapters installed.
Only set the default gateway on the adapter used for external communication.

To resolve external hosts, use forwarders in the DNS server settings.

-Logon failure: the target account name is incorrect.
I normally encounter this error when the PC needs to be rejoined to the domain
To do this right click my computer icon on the desktop
and select properties
Select the computer name tab
select change

Select member of workgroup
and enter your domain name.
enter the local adminstrator account and  password
click ok.

Go to the server and delete the computer name from active directory.

On the workstation
Click on change again
and select member of domain
enter your domain name
login with the domain administrators account and password
Turn off the PC.
Reboot the server.

If u turn on the PC, make sure it has the network cable disconnected first.

Then change it's name, shutdown, connect the cable and restart.
Then rejoin the domain as per Nyaema above.

sadasupportAuthor Commented:
The problem is not on the workstations any longer. I can easily change the workstation computer names. My issue is that Active Directory is not working on the server. Computers that were sucessfuly joined to the domain prior to the problem can no longer find the domain, and therefor, cannot log in. The DNS service is still running. I might try reinstalling DNS.
As you say, I think you should try re-installing DNS on the server.  Do you have any other AD servers on site or is it only this one?
sadasupportAuthor Commented:
It was only the one server - Reinstalling DNS fixed one problem, but created another. We were 6 problems deep until we decided to re-image the server with a god backup from the night before and restore the data. To much time would have been spent fixing what was broke.

A good rule of thumb, make sure you odn't add PCs to the domain that have the same name as the DC.

thanks anyways folks.

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