Client/server communication is blocked by firewall

I am runni开发者_如何学运维ng an online game site in which the users login to the web site and open a game client (Java applet) that communicates with the game server (also written in Java) by opening a socket connection to port 3000 of the same host.

There is a problem with this model in that sometimes the client network has firewall rules that block all ports except for port 80. So in effect the particular user can browse and login to the web site, but he cannot play because the connection to port 3000 is blocked.

I am looking for a solution to this issue and hope to hear suggestions from anyone who has had a similar experience.

Many thanks,

Andy

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Can you use somesubdomain.yourhost.com:80 instead of yourhost.com:3000?