I have to upgrade Magento from to and in that case I cloned the live system to an sub-domain of the live Domain. I always fixed the multi conflict with issue and getting upgraded I thought, but I dont know if it realy worked. Because when I hit the refresh Button after upgraden via Magento connect Manager I got an blank page and when I try to went back to the backend I got an 404 Error and also at the frontend. Every Site is gone into the Magento 404 Page.

I spend hours of time to fix it and try the solves of this threads:

But nothing works for me.

Do anybody knows a fix that I dont try until yet?

  • Did nobody knows a fix for that issue? I do realy need help with that problem
    – Inoworker
    Dec 11, 2017 at 7:40

2 Answers 2


Temporary Solution:

Goto 'core_cache_option' table and set all the values to 0

(You are disabling all the Cache Types) block_html, collections, config, config_api, config_api2, eav, layout, translate

and refresh the Home page. It will work.

Solution http://devdocs.magento.com/guides/m1x/ce19-ee114/ce1.9_release-notes.html#ce19-1936

Be sure that there is no php warning in your code (website).


My solution, go to file app/Mage.php on line 808, replace

$file = empty($file) ? 'system.log' : basename($file);


$file = empty($file) ? 'system.log' : $file;

and comment the following line

if (!self::helper('log')->isLogFileExtensionValid($file)) {     

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