UDP write causes generic error

[KevMi]

Hi,

I have a test system made out of cFP-2210 and some modules. Test System is a stand alone but it should also be controlled with PC. Test system should send a short UDP message to all 139.0.0.* adresses (port 12343) when it has loaded some sequence, but writing to 139.0.0.255 address causes error 42. If I change it to write directly to my PC's ethernet card(ip 139.0.0.3), sending works fine(sender picture). Anyone have any idea why? Is there some fixed limit that cfp can write to at the same time?

Or can it cause some problems that cfp's own ip is 139.0.0.30?

My firewall does not show any traffic in those ports I have used, even when the UDP writing is succeeded. In other ports do have a lot of action (mainly ports 5000 and 6000). And there is not any firewalls blocking traffic.

  this the receiver on PC

 and this is the sender on cFP when working. When I change the ip to 139.0.0.255, it does not work.

Thanks for replies,

Mika

[KevMi]

And I forgot to say that I am using Labview RT 8.5.1