Whew! complex network--the thorough info really helps. Although most of your settings look good, something is still blocking incoming connections, or this line would say "TRUE"

I can't help with the proxy settings and the forced IP port, but if you are listening on 8080, the firewall probably needs 8080 to be opened too.

The Network pane of System Preferences, under the Ethernet tab, also has a tab for Proxy settings. Perhaps the person responsible for the Proxy server could advise you how that should be set up?