Thread: System call and Connection refused

Dear All

I'm face with a problem that I can't imagine why it is happening.
Probably it is not a MPI problem, but I will be grateful for any help.

Basically, I have a Client, which is a master(rank 0) of mpi application, and Server (all programming in C), which they communicate by sockets.
When I run the both separated, I mean in different shells , works fine.

But, when I made the Server call the Client (by the function "system()"), I received this error:
"Connect: Connection refused"

I'm wondering what is the different between the both running methods, permission?

Regards

Tiago

Are they both, by any chance trying to open the same port?

They are different application, there is only one Server listening in port 5000 (per example).
I don`t think they could open the same port.
Thanks