500 internal server error at back end - Joomla

Solution 1:

First you have change folder permission to 775 for the following folders:

cache, logs, tmp & administrator/cache

then go to: configuration.php

find code:

$log_path = 'XXXXXXXXXXXXX';
$tmp_path = 'XXXXXXXXXXXXX';

and change code into:

$log_path = './logs';
$tmp_path = './tmp';

problem solved :)

Solution 2:

I had this problem, but none of your advices didn't help.
I fixed a problem only after I switched off all modules via PhpMyAdmin (PMA).

Table modules, changed parameter "published" to 0 for all and then enabled only few modules with these types:

• mod_login
• mod_menu
• mod_sumbenu
• mod_toolbar
• mod_title

After this I entered admin page and used top menu to enable all needed modules one by one. After admin page started to give me 500 error again I knew what module is faulty and I disabled it again via PMA.

Solution 3:

May be some files are not uploded.Check failed transfer of your FTP server.Make sure all the files are uploded online