Mike,
Have you looked in the process log to see if there is an indication of what caused the thread to go into an Opening state?
Have you tried stopping both sides; then bringing the Server (Receiving System) side up; then once that is up bringing up the Cloverleaf(R) Sending thread (without changing port numbers)?
If the above works, then that is usually an indication the receiving system went down and did not free up the port to allow a reconnect attempt.
What happens if you just stop the connection (assuming it is up) and then start it (when it is in a normall running state – not when the situation you observed is occuring)?
Jim Kosloskey
email: jim.kosloskey@jim-kosloskey.com 30+ years Cloverleaf, 60 years IT – old fart.