Screen sharing in OS 10.6.8
I am missing something. I'm trying to help my father by setting up his computer to share his screen with me across the internet. I have gone to "sharing" in preferences and set screen sharing to "on." I have found my name in the allowed user box (from his address book) and declared myself a user. I have made note of his vnc number. But when I "connect to server" at my computer and punch in his vnc:// (number) the connection fails. What am I missing? (I also tried this same procedure the opposite direction, to share my screen with him, but that didn't work either.) Both computer are on WIFI connections in their respective houses.
iMac, Mac OS X (10.6.8)