Port 1812 is already in use error
I have just installed the Symantec Endpoint Protection Manager (on Windows 2000 Server, configured as primary domain controller, w/Service Pack 4). During the Management Server Configuration Wizard, I had a couple of problems with the database section. The main part of the window said "The embedded database requires and uses TCP port 2638, but this port is being used by another application. Change this TCP port number for the embedded database and then complete the installation." But when I tried to change the port, it gave me an error saying that it has to be port 2638. Why does it tell me to change it when it won't even let me?
Then, when I tried to continue anyway, it popped up with the error that I partly mentioned in the subject: "Port 1812 is already in use. Stop your RADIUS server if you have the Enforcer installed." (What's the Enforcer?) But it continued and acted like it finished. Then it automatically launched the Symantec Endpoint Protection Manager Console, and it lets me log in fine, but then if I choose Home, Montiors or Reports it gives me the "This page cannot be displayed error" HTTP 500 - Internal Server error.
Next, I went into the ODBC data sources manager and opened up the DSN called SymantecEnpointSecurityDSN, and clicked 'Test Connection' and it gives me an error message window, that pops up and says "Connection failed: Specified database file already in use".
So are these 3 problems all related? How do I fix this stuff? I do not have RADIUS installed as far as I can tell - I do not have an "Internet Authentication Service" in my services list. I do have Routing and Remote Access installed (but it's set to Windows Authentication). I tried disabling that, and going through the wizard I mentioned at the top of this, but still got the same problems. I do not have any other RADIUS server as far as I can tell.
The only other software that I have on this server is Quickbooks 2007, 2008, CA Brighstor ArcServe Backup, APC PowerChute Business Edition, Symantec Small Business 10.1 and pcAnywhere. I don't think any of these programs use port 1812 though.
Anyone have any ideas?