any port you like, can be changed in the config menu, then in the viewer just type in <ip>:<port number>. then make sure you have configured your router to forward the port to you pc
are you running the latest version of ultravnc?
test the port is forwarded corrected http://www.canyouseeme.org/
outgoing connections should be ok, tho could have blocked it
if all else fails give logmein a go, saves all the hassle of port forwarding and firewall configuration
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