Multiple socket clients

I am writing a simulator that talks to an existing server. This server
accepts multiple (12) connections, in the real world from PCs that are
transfering messages from hardware devices.

If I connect to the server locally, that is, my client running on the same
box, it's fine and I can run multiple instances .. as long as I'm using the
loopback address (127.0.0.1). If I utilize the real IP address, the 2nd
connect works, but breaks the first connection with a -1 ECONNRESET (or
whatever, not handy right now). Doesn't matter if I'm on the same host or
not when I specify the server's IP. Only the last session persist.

I'm able to connect from multiple hosts but the previous connection is
always reset once the second connection is made.

Am I missing something fundamental here?

TIA
.

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