500 error in joomla login form

[Alken Jarge]

Go to libraries/joomla/application/application.php

Comment this line

$this->triggerEvent('onUserLoginFailure', array((array) $response));

And set Change Permissions of this file 774

It will work fine and save your time

[dsonesuk]

Are you sure you have the path to log directory setup correctly in global configuration, 500 usually shows on incorrect login instead of incorrect username and password warning, when the path is incorrect and can't log a failed login.You should not alter core joomla files, or set these files permissions greater than 644, and this amendment will be overwritten when ever joomla updates.

[Alken Jarge]

many time we change the joomla code according to requirement and when site is working fin then no one will update joomla website and if anyone update joomla website so again we have to do this and more code we have change , actually joomla site update means new site with same look and feel so u can use it ..