Some sites dont work on my backend site as example configuration-> site

Hi Henning,

You need to change the php configuration, your current value of this "max_execution_time" is 0, you need follow our recommendation value, the recommendation value is 300

Please contact your hositing provider for this

thank you!

I am realy sure that the value is 300... If i click in backend of Jomsocial i get a white screen. So i cant work with Jomsocial...

thats my error log:
20.07.2016 02:39:25 os-vp.de [client 2003:70:8f00::] FastCGI: "/home/strato/http/fastcgi/rid/83/43/51678343/htdocs/jd_newyork_quickstart1.1/administrator/index.php" aborted: no response after 123 sec (idle timeout 120 sec), referer: os-vp.de/administrator/index.php?option=com_community

Hi Henning,

Please check the screenshoot your php config on your site, the value is 0