Hey, been googling on this forever so now I gave up and here goes. I installed HHVM with the 3.1 update and it's listed as selectable and it also starts when I assign it to a host. Works brilliantly. But... About 4-6 hours after the host has started the HHVM-instance for the host goes away and doesn't come back unless I do a restart of that hosts HHVM. I can't find any reason for it.. The only thing the host error log says is: [Wed May 24 19:15:43.126629 2017] [fastcgi:error] [pid 10293] (111)Connection refused: [client 126.96.36.199:32592] FastCGI: failed to connect to server "/var/www/clients/client3/web9/cgi-bin/hhvm-fcgi-*-80-hostname.tld": connect() failed Which states what I already know.. the hhvm-instance has gone away -- I've tried enabling more logging for HHVM in /etc/hhvm/* but my error log is empty..