"UDP receiver.vi" does not work on the type of "public" network but on a private type and the field. Why so much?

I have a configuration Ethernet with 'UDP sender.vi' and "UDP receiver.vi" basically back in as the eponymous example shipped in LabVIEW examples i.e. pair. Nothing special and quite basic.

The UDP sender regularly sends out UDP (30 bytes) packets to the receiver using the number of receivers IP and port 80. However, the port number is not interest to the problem.

The sender and the receiver are different machines, but the two LabVIEW 2011sp1/32, Win7/64
If it is running on a domain network, it works very well. If it runs on a 'public' (Windows Firewall terminology) using the network - IP number data comes through in the Receiver.vi 'UDP '!

I checked what is obvious:

  1. The packets arrive actually in the network interface (checked with Wireshark) UDP receiver computers. For example. Connection via the sender's public network and firewall it meets on his way there.
  2. firewall on the receiver PC is open for incoming traffic on port 80 for the public (and private + domain name) and open for all programs and allowing the crossing side (there is a router with NAT translation upstream). We even tried to disable the firewall completely - no change.
  3. A program with a similar function as ' UDP Receiver.vi ' but written in C++ running in the same exact state, works as expected.
  4. same "UDP Receiver.vi" running on a target RT (sbRIO9606 or cRIO9024) and off the coast of the exact same cables copper - works as expected.
  5. It is tested on several PCs with the same results.

    For example. everything is, as far as I can see, according to the 'books', and again, I must have missed at least one book. The data arrives in the PC network stack - otherwise the program c ++ would work either. So what is done differently in LabVIEW?

Any suggestions as to why a C++ program or a RIO can read the 'public' port UDP, but such a LabVIEW program cannot? And especially what can be done to solve it.

Thank you
Henning

There are many other services that is blocked by nature in Windows when you use a network connection of type 'Public '.  Have you added an exclusion for LabVIEW so LabVIEW is not blocked when using a network of type "Public"?

Tags: NI Software

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