VPN problems in a PC behind an ETEC PT-3818 router based on Conexant AMX-CA61E chipset

I'm trying to access my computer in Portugal using a VPN. Here in the UK I have a ETEC PT-3818 router with the DMZ option enabled for the IP address of my computer (10.0.0.3), for instance this is enough to run eMule without port fowarding that I had to do in the past to get maximum speed downloading. No port is forwarded in the Virtual Server. I have all the VPN client and server well installed on both computers. I can ping my host computer in Portugal and receive the answer.

If I use this one in the UK as the Server and connect from Portugal using a client I can access my drives in this PC from Portugal, but the opposite doesn't happen. I always get Error 800 when I try to connect. I don't know what to do more and I really hope this is enough information to get some help. If not I'm here to answer all questions. Sorry if the English seems too confuse.

Thanks in advance
ZNLDSGAsked:
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ewtaylorConnect With a Mentor Commented:
2 things to check.
Make sure the firmware is up to date on the routers. Microsoft says that this is a router firmware issue.
Also if you are running NAT you might need to download this and try it. http://support.microsoft.com/default.aspx?scid=kb;en-us;818043
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ewtaylorCommented:
What operating system are each running?
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ZNLDSGAuthor Commented:
XP Professional in the server and Home edition on client
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ewtaylorCommented:
Make sure you have the builtin firewall on both computers disabled. Are you running any other firwall software i.e. zonealarm, norton personal firewall etc.?
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ZNLDSGAuthor Commented:
No Firewall software, no firewall in the conection itself
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