I have my server running on digital ocean with nginx and hhvm, it was working great for the last month, then i had to restart the server and going to restart the services as nginx php-fpm and hhvm i got this error: Unable to read pid file /var/run/hhvm/pid for any meaningful pid So i thought was a permission issue and give it the full permission doing sudo chmod +rw /var/run/hhvm/pid and even sudo chmod -R 777 /var/run/hhvm but it doesn't fix this issue. Now my website is off for this reason, and unfortunately i don't have any idea what the problem can be. Will be really appreciated if you could direct me to fix the problem. Thanks My OS is ubuntu 12.4