Hello!

You need to check this items:

1) Defined port may be closed for external connect, you can check it with command:
telnet mydomain.org PORT

2) Certificate problem: namely there are may be wrong paths to certificate files in Jot Server's config/config.json file or certificate is expired.

Also check please Jot Server folder if it contains log.log file, it appears when you have a problems.

You may also check browser controls on Messenger page. It should contain errors, errors may help to understand the cause of the problem.

If it doesn't help contact me directly via PM, I can check.