VNC eternal ip address problem.

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http://www.linuxforums.org – I've installed vnc4server on Ubuntu server edition....i've opened ports 5800 and 5900 on the router now i can access vnc server from the external ip address on ubuntu but when i try to access it on any other client such as my windows machine i can't use the external ip address......what is happening this is really weird.......i'm using tightvnc client as the client which isn't a problem because i can access it from the lan IP its just the external one giving me a problem...can somebody help me out plz....and if its not too much trouble how do i make vnc startup at startup? (HowTos)