I have already reported this BUG at sf.net but for general Discussion I do it here again.
I have a ISPc installation on an Ubuntu 7.04 Server.
When I open the https://server:81/
Site in my Browser it hangs nearly every 2nd time at the ISP Manager.
I also have Ubuntu 7.04 on my Client with Firefox 188.8.131.52.
It works without any Problem under Windows.
After a little while I get the possibility to stop the script.
I've tried this at 2.2.14 and 2.2.15 and now at 2.2.16.
It makes no difference if I use http or https.