OM blocked on some computers

[K. Kamhamea]

I use OM Version 6.2 to communicate with customers. Unfurtunately in about
50% of cases OM is blocked, while my website from the same domain but
different IP is not blocked. In some cases we could overcome the problem by
booting the Win11 laptop from an Ubuntu USB. In others I don't know. My
questions are:
1. Is there a trouble shooting guide for this problem?
2. Can this be an IP:Port problem? I still use the 5443 port.
3. Is this problem solved with the newer version 7.2?