[Zope] Newbie config problem: server only responds to localhost requests

I've configured 2.6.2 on an in house server behind a shorewall firewall. Shorewall is forwarding port 8080 using a rule entry that differs only in port number from the NAT entry for traditional, port 80, requests; port 80 is being served correctly. Log entries show the 8080 packet being forwarded wget requests to localhost and the local IP address succeed; appropriate entries appear in var/log/zope.* External requests fail No entry turns up in the zope log(s). Any ideas? Thanks. Jack