Can I use RDP or VNC to connect to my on-campus computer from off-campus

Answer: 

No.  RDP and VNC are blocked at the campus border and at the CoC level. There's a write-up at http://support.cc.gatech.edu/utilities/alerts/firewall-changes with further details. As per that write-up, you'll need to use ssh tunneling. We do not officially support ssh tunneling and so have not provided documentation, but instructions are readily available online.

For a complete listing of the ports that are blocked, please see http://faq.oit.gatech.edu/content/which-ports-are-blocked-inbound-border