GMS web page thru iChain

Howdy, all:

For your consideration - been running GroupWise mobile server on an
internal server for quite some time now, and had set up a host-based multi
for the GMS web interface. Worked just fine, no problems, life was good.
Used an existing web address and just pointed to the GMS server internally
from it.

Upgraded to GMS v2.0.3 Sunday night, and now am getting a 404 - Object not
Found error thru iChain, but if I copy the URL directly from the 404 page
and change it to point to the internal DNS name of the GMS server, it
connects just fine and displays the login page. I'm wondering if there's
something about the redirected information that iChain isn't passing
correctly.

The original URL:

http://<external DNS server name>/gms (it's just redirecting to port 80 on
the GMS server, the /gms is stripped.)

The URL then flashes up like this for a short time after hitting "go:"

http://<external DNS server name>/gms/genweb/SwitchModule.do?
prefix=&page=/loginRedirect.do

And then the URL that's showing when the 404 page is displayed.

http://<external DNS server name>/genweb/html/ext/Login.do?
prefix=&page=/loginRedirect.do

Ideas?

Thanks,

Jim