Hi,
It seems like the network may have firewall which blocks certain streaming. Please try this set up and see if it works:
Gstreamer TCPserversink 2-3 seconds latency - #5 by DaneLLL
We run the server command on Jetson device and client command on host PC in Ubuntu 18.04 or 20.04. It works well in the set up. Please give it a try.