Reading large blueprint graph screen shots is super annoying, unfortunately – I wish there was an easy way to export the blueprint graph as readable text…
Anyway, whenever I have a “what’s going on?” problem with networking, I install Wireshark, and do a capture of UDP port xxxx (for whatever port I’m using.)
If the computer gets the data, but not your program, then you know to debug your program.
If the computer doesn’t get the data, then you know to debug the sender (or firewall, or other network part.)