Unable to access the WCF service over VPN!

Heres the scenario, im on a network A, and i use a vpn client to connect network B to access the webservice which can be accessed in network B.Even though im connect to network B , im unable to access the开发者_StackOverflow社区 webservice link.Do i need to configure any settings.

But if u r originally in network B and even though if u have connected to network A using vpn client, im able to access the webservice link. But the other way isnt working.