Back Office - error 500 only on certain pages: Solved

[skinnybloke]

Hi - I am getting an 'Error 500 - Internal Server Error' on certain Back Office Admin pages, but not all of them.

 

The ones I am having this problem with are:

 

 

orders - invoices

orders - merchandise returns

orders - delivery slips

orders - credit slips

customers - groups

customers - customer service

shipping - preferences

localization - localization

localization - countries

localization - taxes

preferences - general

preferences - orders

preferences - products

preferences - customers

preferences - themes

preferences - SEO & URLs

preferences - images

preferences - store contacts

preferences - search

preferences - maintenance

preferences - geolocation

advanced parameters - email

advanced parameters - multistore

advanced parameters - db backup

advanced parameters - sql manager

advanced parameters - logs

advanced parameters - webservice

administration - preferences

 

administration - employees

 

In the error logs there is this information:

 

 

 

[Wed Oct 26 11:07:15.022475 2016] [core:error] [pid 20194:tid 140371225069312] [client xx.xx.xx.xx:58844] End of script output before headers: index.php, referer: 

 

Anybody any ideas?

Edited October 29, 2016 by skinnybloke (see edit history)

[tuk66]

Enable Debug mode to see the error.

[skinnybloke]

Hi - I've tried that but no additional errors are displayed

[Knowband Plugins]

We recommend you to check discussions on following links, it might help you.

 

 

http://forge.prestashop.com/browse/PSCFV-10791

 

http://serverfault.com/questions/80929/disable-the-timeouts-on-apache-httpd-and-fastcgi

[skinnybloke]

Hi - I tried making changes to various parameters in the PHP Configuration Editor as per these topics but to no avail...

 

... but I am working ok now after upgrading PHP to v5.6 from v5.4 using EasyApache3.

 

My sites were previously working ok under PHP v5.4 so I can only assume that something became corrupted somewhere.