newsservers access from behind a firewall

hi there!

I tried to find an answer, searchin here, but didn't find... so here is the problem (quite common I guess):

I'd like to retrieve (and post) on usenet with an usual news client (say Forte agent newsreader),

- BUT I'm behind a firewall which only accepts connection through an IP (192.168.xx.xx on port 8080) with a login and password,
- AND I don't want let my admin know what I'm doing on usenet...

so what is your advice? I'm lookin for a simple (?) solution, with affordable settings.... I'm lost with all these proxies/tunnels/socks threads....

If someone is in my case and found a solution ("usenet from behind corp. firewall for dummies"), please share it!

Thanks