I would like to use the same port which the site A uses when it connects to the site B.

Yes, you can have a same listening port at both sides.

Thanks for the response.
Yes,
I know I can listen same ports but my question is,
can I do that at "Site A" without opening any ports at the routers/firewalls?

As soon as you have a listening port on a LAN accessible from the outside thru a firewall or NAT router, you have to "open" the port.

The goal is to have ports open only at site B which is the server.

The use only one socket and make all communications over that unique connection. No other choise in your situation.

--
francois.pie...@overbyte.be
The author of the freeware multi-tier middleware MidWare
The author of the freeware Internet Component Suite (ICS)
http://www.overbyte.be

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