RT 7.x Bug: (default) Limit of 15 TCP Connections

[Jim Kring]

I built a LabVIEW RT App and found that I couldn't connect more than about 15 (TCP-IP) clients to the target machine. This includes MAX (Remote System Explorer), LabVIEW RT, FTP, Web Server, and any other TCP-IP clients. Fortunately there is a fix for this problem. Here is a response from NI Support:

It turns out that the hidden setting in the ni-rt.ini file that we thought had a default value of 100, actually had a default value closer to 30.  Depending on how many ports were being used at a given time (i.e. - MAX, webserver, VI Server), you'll have to subtract roughly 15 from that number to get the number of available ports for your other clients.  Add the following line of code to your ni-rt.ini file:

[TCP_STACK_CONFIG]

Max_Sockets=50

With a setting of 50, you'll have approximately 35 connections.  There may still be an upper bound on the number of ports you can have open.