1. In cPanel server, where php is handled with suPHP, the majority of internal server errors can be solved verifying and modifying files and folder permissions. If you use permission 777 (grant all permissions to owner, group and public), this may cause the error. The best way is to change folder permissions (chmoding) to 755 and files to 644 (except if specified by the software developer).
You can mass change all the files and folders permissions in case that you change from another host that didn’t had this problem. Changing tons of folders maybe a hard task, so let’s go with a simple way:
To change all folder permissions to 755, open SSH and type:
find /home/*/public_html -type d -exec chmod 755 {} \;
To change all file permissions to 644, opeen SSH and type:
find /home/*/public_html -type f -exec chmod 644 {} \;
2. Another common reason for this error is the .htaccess file trying to change PHP flags. Some hosts don’t allow that (only changing php.ini files). Open your .htaccess files and check for entries like “php_flag” e “php_value”.
If you find any sort of entires try removing it and then check
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