Ask them if there is a way you can not be behind the firewall, or if there is a way to work around it. To use CU-SeeMe through a firewall, you must open certain ports on your firewall to allow data to transfer freely. The ports are outlined below. These ports must be opened to allow communication in both directions, both incoming and outgoing. Currently, CU-SeeMe does not work through a proxy server doing Network Address Translation .
Proxy servers do network address translation.
If you are not sure if you are networking through a proxy server, contact your network administrator. Take it to your ISP's system administrator if they have you behind a firewall. If they can't do what Whitepine requires to make CU-SeeMe work for you, then find an ISP that does not put you behind a firewall. Some other free services, such as Hotmail, seem to be fine. Conferencing Software for Internet Tutorials All of the Oxford tutorials use CU-SeeMe interactive software.