I'm trying to use the HTTP proxy, but have a couple of sites users need to
be able to get through on non-standard ports, like www.test.site:88.

I have filter exceptions in place and can get to the page no problem until
I put the proxy info in the browser (port 80 not blocked on the firewall
yet). then I get a page can not be displayed. I've read about creating
generic tcp proxy, and tried to set one up, but it doessn't work and I'm
not sure that's even what I need to be doing. I also created an access
rule exception for the destination ip address with port 88 specified, but
that doesn't seem to help. I'm not using transparent proxy.