Network connection-restatement (sorry)-server can't find client

I'm having trouble getting a CODE/400 server connection when working through
my network connection.  I can't get the error list back when I submit a
compile; everything else (LPEX, Verify, GUI prompting, etc.) works fine.  I
know I could Verify first, but basing on caching performance, it's faster to
compile.

I have two systems connected to a Netgear RT314 Gateway Router (no ROTFLYAO,
please) and then into a cable modem up to the 820 via a firewall.  The RT314
provides NAT and some firewall protection.  The IP address seen by the RT314
is not fixed (today it's 65.34.yada.yada); within the LAN, the RT314 is
192.168.0.1 and the other systems are ".2" and ".3".

When I use a dial-up connection (without the RT314), everything works fine
(because CODE/400 knows my IP address).  I think this shows the server end
is not causing the problem.

I assume the RT314 is the issue.  The iBox is giving me EVF4000, "A remote
host refused an attempted connect operation."  (3425).

I'd be grateful for any help...

Thanks,
Reeve