@bache_plus can you try telnet, if one of 3333 or 443 is reachable for you? This is what you should see if target port is reachable:

For port 3333:

For 443:

If there is any issue with network route, you will see "Connection refused" and "Unable to connect to remote host".

You may need to enable telnet command if you are on windows:
https://www.rootusers.com/how-to-enable-the-telnet-client-in-windows-10/