Issue with TCP Listen.vi under Linux

[Chris_12345]

I have a Linux machine that is configured to have two IP addresses (192.168.0.X), with one physical ethernet jack.  When running a program on it (employing TCP Listen.vi) to establish an ethernet connection to a remote machine, it works great.  If the program is re-entrant and I have two of the programs running simultaneously, each wired with a unique IP address and port number, it still works great.  If I use the same IP address for both of them, but unique port numbers, it still works great.  However, if I use unique IP addresses but the same port number for both of them, I get Error 60 (connection already in use).

For example,

192.168.0.11:6000 and 192.168.0.12:6001 --> OK

192.168.0.11:6000 and 192.168.0.11:6001 --> OK

192.168.0.11:6000 and 192.168.0.12:6000 --> Error 60

I've tried wiring in the specific IP address into TCP Listen.vi, to no avail.

Any ideas on why this might be occurring?

Thank you in advance.

[Chris_12345]

Attached is a whittled-down version of the software, which duplicates the problem. The executables were built on a SUSE 11.1 Linux machine running LabView 8.6.1, but I have included all the source code.  The two halves of the software are Main_Host.vi and Main_Client.vi.

[Chris_12345 · Accepted solution]

Attached is a fix for the problem, after discussing this with an NI engineer.

[DjDaveNI]

Hello All,

The fixed version is based on the KnowledgeBase article titled "Why Do I Receive Error 60 from Create Listener for 60 Seconds?". Happy programming!