I had the same sort of issues and what I needed to do to fix them was have my linksys router (under applications and gaming) set up the Computer running the VNC server to enable Port 5900 and THAT...
I am a Nokia 770 newbie myself and have spent a frustrating sunday trying to set it up to boot off the MMC. I had issues with ALL the installs and had to use the Red Pill (How bloody stupid is this...