how to check if there is a thrift service behind a certain port?

[Gianni Ambrosio]

Dear All,
In my application I scan a subnet to find all PCs where a thrift service 
is active on a certain port.
Unfortunately if the port is open by another service (not a thrift 
service) the transport->open() call succeeded. I thought the open() call 
would have failed in this case. The problem is that every call to the 
thrift service throws an exception when the open succeeds but there 
isn't any thrift service behind. It would be nice to know on open if a 
thrift service exists. Is there a way?

Cheers,
Gianni