The new version of rpyc is much more stable and easy to use than the builtin version (3.0.7)
Please consider to update it.

If I use PDG node to start a ThreadedServer on a new process(each work item holds a connection), and the server will be shut down. I've changed some code of the rpyc 4.1.4 to make it work with Houdini, and it works fine now.