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Someone trying to hack my server

I'm getting suspicious security audit failures from an off-network workstation plugging away at various usernames.  I suspect that this are attempts being made through administrative TS sessions.  How do I trap this varmint?
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This is an SBS 2000 server for my network.  It lies behind a Netopia R9100 with firewall rules enabled (but RDP ports open so I can administer it remotely).  I feel stupid to say this, but I'm not sure how to go about trapping the ip address (I'm fairly certain it's coming from outside my network, but all I have is a workstation name in the log).
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Cooperation is a beautiful thing.  Were you being hacked or lambasted by worms?  

-Eric
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Wormed.  Persistant, methodical variations of standard ports and accounts.  My client does not really want to pay for someone to invest the time to track down the offenders.  I'm thinking of moving RDP and POP3 to non-standard ports.  I think I will open another thread to talk about how the firewall on my router is configured.
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In fact I did open another thread in case you all want to follow it there:

https://www.experts-exchange.com/questions/20820439/Best-way-to-filter-worm-attacks-from-my-Netopia-R9100.html