Connot connect to port on server : networking problem?

Hi,

We have a unique problem, which I am sure is due to netwroking setup,
whereas our adnministrator are caliming otherwise. We are running
RedHat Linux 3.

I have written a service which listens on a port. Its running on a
server test.xyz.co.in with IP 10.10.50.10. Whenever this listener is
not bound to the hostname, it accepts connections from any machine
whether that request is given with IP or fully qualified server name.

However, whenever we bind the listener to tha particular hostname
(test.xyz.co.in) and we try to connect to it from the server itself,
it connaot connect when request is given with IP but connects when
request is given with hostname. BUT, we connot connect to the listner
from any other machine either by using the hostname or IP.

Our requirement is to start the listener bound to hostname (we have no
choice in that) and connect to it from client machine again using
hostname.

Th e DNS is supposed to be configured on the server 10.10.50.99 in
sense that we can ping the test.xyz.co.in without a host file
mapping.

My feeling is that the there is something missing in network/DNS
setup. Can someone guide me what to look at.

TIA

Amitabh
PS: Sorry for long post