Joomla 2.5.* – Can’t Login to backend
If you can’t login to Administration Panel of a Joomla 2.5.* site, try setting above in You configuration.php :
public $cookie_domain = '';
public $cookie_path = '';
Quick fix for the directories permissions:
chmod 755 administrator language/overrides language/en-GB libraries cache administrator/cache modules media plugins templates tmp logs images components administrator administrator/language/en-GB administrator/language/overrides administrator/manifests/files administrator/components administrator/language administrator/manifests/packages administrator/manifests/libraries administrator/modules administrator/templates