Hi Mamta,
You can check do a simple test using telnet.
Open a console (Start -> Run -> CMD)
type:
telnet ld9155 30015
If you go to a blank screen, the server is listening and you have no network issue
Here a simulation that should fail (except if you have an instance 99 on this server, or another app listening on this port):
Connecting To ld9155...Could not open connection to the host, on p
ort 39915: Connect failed
Regards, Fernando Da Rós