Windows Terminal Server brute-force attempts

Somebody is constantly running automated brute-force attacks against a Windows Server 2003 Terminal Server I published on WAN.
It is joined to a domain and I have Account Lockout Threshold GPO defined to lockout an account after 3 login attempts.
I also use local accounts on this server and I also set up local GPO Account Lockout Threshold to 3 login attempts.

But I still see regular logs in Event Viewer for numerous failed login attempts for non-existing domain and local users. These seem to be common usernames like admin, root, scan, etc.

What could I do to block all these attempts alltogether?
proteus-IVAsked:
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rscottvanCommented:
If this server does not to be accessible from the whole internet, you can use Windows firewall, or preferably a hardware firewall, to restrict the systems that can attempt access.

You can also move RDP a less well-known port.  http://support.microsoft.com/kb/306759.
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proteus-IVAuthor Commented:
I will upgrade the OS to Windows 2008 and implement certificate based authentication.
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proteus-IVAuthor Commented:
Incomplete solution.
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Windows Server 2003

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