need...more...input
router == modem?
or do you mean:
client(->LAN)->router->sme->modem(->WAN)
server setup: server-only/server-gateway?
server version: 6.0/6.0.1/6.5rc1 etc...?
Origin of browser session: far side of modem (WAN)?
What remote access settings did you enable to test successfully with ssh?