How does one disable remote server connection in windows2003?

Method 1: use the local security policy

Choose Control Panel> Administrative Tools> Local Security Policy on your computer->
Security policy --> Local policy --> User permission assignment --> refuse to log on through terminal services "add the user to prohibit remote access so that this account cannot be remotely

Method 2: delete a user

That is to say, on the server, right-click "My Computer" -- "manage" on the desktop and find "user" under the local user group on the right to delete or disable logon.

Method 3: use third-party tools

For example, if a computer name is added to the remote control of dongle, only the specified computer name can be used to log on to the server.