Originally Posted by till
This is no behaviour that could be reproduced on any other server by one of the developers.
Well, I just created a new ISPConfig installation based on 18.104.22.168, and the problem is still there. After a couple of clicks on PHP pages, lsof
climbs to the tens of thousands.
If any of the developers are interested, I can give you SSH and HTTP access to this server. Message or email me and I'll send you the login details.