When trying to log in I am seeing the following error message:

JAuthentication: :authenticate: Failed to load plugin: plgauthenticationcookie Invalid password

I am not able to log into the back end with any users. (Version Joomla 2.5) Does anyone know where I should check to try to fix this problem?


Having done some research on the topic, I found this:


The solution provided by the author says to completely removed the plugins directory and replace it with a fresh copy from a new copy of Joomla, which you can download here


Hope this helps

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  • Sir i try this .. it totally down my site ... – Shehryar Nov 18 '15 at 10:13
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    What do you mean by "it totally down my site"? Did you get a blank screen or error messages? – Lodder Nov 18 '15 at 10:22
  • means no display on front end and back end as well... – Shehryar Nov 18 '15 at 10:34
  • Please open your configuration.php and set $error_reporting to development. Once done, report back any errors. Could you also let me know your exact Joomla version...not just "2.5", but the number after, for example "2.5.28" – Lodder Nov 18 '15 at 10:45

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