I'm not sure what the signifigance of your "service port is 6000" point is...
that said, I'm firmly confused on all levels w/ regard to the description of your problem.
1. click start-> run -> sysdm.cpl
click on the remote tab...
is remote desktop checked?
If not... CHECK THE BOX!
2. are you trying to connect to your XP box locally (e.g. within the confines of your local network, or are you trying to accomplish this task remotely over the Internet?)
3. do either one of the machines have a firewall installed? if the host machine is blocking the inbout request... fix it.. if the client machine is blocking the outbound request... fix it....
check the points I mentioned and provide some more feedback.