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Event ID: 529 is occuring every second in the Security Event log

I am showing just one example of the event in the event log. Event ID occurs almost every second. Is there a way to stop this from happening? This is an SBS 2003 server.....
Event.txt
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Cris Hanna
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btan

Common causes for invalid logon events:
- Forgotten passwords, someone is entering the wrong password.
- An unauthorized individual is trying to gain access to the network.
- There is a persistent network connection with an invalid password.
- There is a service using a user account with an invalid password.
- Trust relationship has been broken.

Logon type = 10 = RDP
This implies you have the RDP port open (3388).

Your options (As far as I can see) are:

Disable port forwarding on the firewall for this port and use the built in Remote Web Workplace. Restrict (on firewall) the allowed source ip to your one (so only you can connect in). Restrict (using IPSEC on the server) the allowed source ip to your one (so only you can connect in.. Passwords, must be strong and changed regularly.  Or have the true administrator acount disabled in SBS - reduced exposure of such high admin priviledge account ...(do have other username instead of the usual "admin" etc)
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