apache proxy_fcgi - The timeout specified has expired - Error dispatching request

Question

I have an application in PHP which returns me:

[Thu Oct 05 22:10:59.351244 2017] [proxy_fcgi:error] [pid 3733:tid 139869435164416] (70007)The timeout specified has expired: [client IPADDRESS HIDDEN:46777] AH01075: Error dispatching request to : (polling)
[Thu Oct 05 22:16:27.701213 2017] [proxy_fcgi:error] [pid 3732:tid 139869359630080] (70007)The timeout specified has expired: [client IPADDRESS HIDDEN:46988] AH01075: Error dispatching request to : (polling)
[Thu Oct 05 22:21:52.971235 2017] [proxy_fcgi:error] [pid 3733:tid 139869426771712] (70007)The timeout specified has expired: [client IPADDRESS HIDDEN:47055] AH01075: Error dispatching request to : (polling)
[Thu Oct 05 22:25:23.561216 2017] [proxy_fcgi:error] [pid 3732:tid 139869351237376] (70007)The timeout specified has expired: [client IPADDRESS HIDDEN:47115] AH01075: Error dispatching request to : (polling)
[Thu Oct 05 22:30:47.591237 2017] [proxy_fcgi:error] [pid 3733:tid 139869418379008] (70007)The timeout specified has expired: [client IPADDRESS HIDDEN:47321] AH01075: Error dispatching request to : (polling)
[Thu Oct 05 22:39:10.211214 2017] [proxy_fcgi:error] [pid 3733:tid 139869443557120] (70007)The timeout specified has expired: [client IPADDRESS HIDDEN:47407] AH01075: Error dispatching request to : (polling)
[Thu Oct 05 22:39:38.591259 2017] [proxy_fcgi:error] [pid 3733:tid 139869376415488] (70007)The timeout specified has expired: [client IPADDRESS HIDDEN:47412] AH01075: Error dispatching request to : (polling)
[Thu Oct 05 22:45:13.951238 2017] [proxy_fcgi:error] [pid 3733:tid 139869582505728] (70007)The timeout specified has expired: [client IPADDRESS HIDDEN:47615] AH01075: Error dispatching request to : (polling)
[Thu Oct 05 22:50:36.491214 2017] [proxy_fcgi:error] [pid 3732:tid 139869460342528] (70007)The timeout specified has expired: [client IPADDRESS HIDDEN:47668] AH01075: Error dispatching request to : (polling)
[Thu Oct 05 22:54:57.661219 2017] [proxy_fcgi:error] [pid 3733:tid 139869326059264] (70007)The timeout specified has expired: [client IPADDRESS HIDDEN:47726] AH01075: Error dispatching request to : (polling)

I think the above messages are - in some way - connected to the following random errors: Note, the XMLHttpRequests (AJAX-call) is coming from the same domain and sometimes does not perform with the errors above. However, normally they do execute?

From what script is this message coming and how can I fix it? There is only one script I can think of which might exceed the default max execution time, however this script is allowed to run longer, using ini_set at the top of the page for the max execution time?

I have no idea where to look and how to fix this issue

Answer 1

Add the following lines into httpd.conf or apache2.conf (depending on your system) file:

Timeout 600
ProxyTimeout 600

and restart apache

sudo /etc/init.d/apache2 restart