> It  is on the same network. I can get to it while I am inside of the
> network  by  http://192.168.100.237:8383  but not if I am at home.

Of  course  not--that's  a  non-routable internal address that is only
valid within its subnet or via static routes on an internal network.

> I  tried  going threw http://mail.domain.com:8383 and I get an error
> message.

Of  course--if  you don't have an internal DNS server, mail.domain.com
will  resolve  to  its  external  NATted address on the PIX, causing a
phenomenon  known  as  NAT  loopback--which  few  firewalls  bother to
support.  (There's  a  way to set up to the PIX to change the returned
address on the fly when sending a DNS response, but that's annoying to
manag, IIRC.)

You  need  to  set up an internal DNS server that will handle requests
for  local  hostnames and resolve them to internal addresses, or use a
HOSTS file on your internal machines. Make sense?

-Sandy


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