For VNC you only need 5900 TCP, no UDP. You can pick different ports too. For exmaple, you could map port 4024 (or whatever) on the SME server to forward to 5900 on the PC. Then from the outside, you could run VNC client and connect to yourdomain.com:4024. I use this technique to setup and route multiple PC's on internal network. If you pick your own port to use, any would-be hacker looking specifically for VNC servers on the default ports would be foiled.
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