As I mentioned, I just wiped my node’s OS and rebuilt it because I needed it working ASAP.
I’m working with some others who are having the same problem. One theory is a KES key mismatch caused by the hard fork.
Would you mind trying to switch out for new KES keys and node.cert?
I really don’t see how that should effect the connection between two machines, but we are trying to systematically troubleshoot this.