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Monday, July 25, 2011

Joomla - Re: JAuthentication::__construct: Could not load authentication libraries

I disabled the plugin - Authentication – Joomla as I thought it was for user logging in the page, not the admin login. It was a big mistake though. To turn this feature on you need to log to Joomla’s database and change published to 1 in the jos_plugins table  in row.Name = Authentication – Joomla (it was = 1 in my case).

UPDATE `your_database_name`.`jos_plugins` SET `published` = '1' WHERE `jos_plugins`.`id` =1;


  1. JAuthentication::__construct: Could not load authentication libraries

    It may happen that you try to login to Joomla Admin and you get following error

    The following error is displayed.

    * JAuthentication::__construct: Could not load authentication libraries.
    * Username and password do not match

    The error occurs when you inadvertently disable the plugin “Authentication – Joomla” assuming it was for the front-end authentication. This plugin is for the admin authentication and no one would want to disable this.
    Authentication Plugin - Joomla Admin

    Authentication Plugin - Joomla Admin

    All you need to do is access the Joomla database through Phpmyadmin, look for “jos_plugins” table and change it’s field ‘published status’ to 1 .
    Authentication Plugin - Phpmyadmin

    Authentication Plugin - Phpmyadmin

  2. Great information.Great thoughts.It is very important to know all the people.It is great and happy to read this blogs.Thanks for making it.

  3. Cannot find any Authentication Plugin - Joomla Admin
    in PhpMyAdmin
    im using Joomla 2.5

  4. Try to set plg_authentication_joomla in the table extensions, to enabled=1 (joomla 2.5.2)

  5. Hi to all.
    I have same issue, Joomla 2.5
    plg_authentication_joomla is set to 1

    and i still have
    "JAuthentication: :__construct: Could not load authentication libraries." error, what can i change to fix it?

  6. Sloved.
    Data base stuck, and it`s take some time to apply change.

  7. hi, I'm using Joomla 2.5.3

    cannot find the plg_authentication_joomla.

  8. Me to, I use Joomla 2.5.4.

  9. Go to:

    Find "Extantions" table.
    In extantions table, go to page 3 or 4, and find there "plg_authentication_joomla" - enaible it from 0 to 1.

    1. this is the most useful help i have ever mate on blog..... Thank youuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

  10. infiniment merci !!!! YOOOO

  11. i enabled "plg_authentication_joomla" - from 0 to 1
    but still nothing happens.
    Now,neither showing error nor authenticating.
    Please help
    Thanks in Advance.

  12. @ Neeraj

    follow the comment #20

    1. Thanks so much - this reply helped

    2. in joomla 2.5.7,
      plg_user_joomla and plg_authentication_joomla

      from table jos_extension

    3. Thanks, you saved me a lot of time.
      Both need to be enabled!

    4. Both need to be enabled
      Thanks you saved my work.

  13. I received same error.. I'll try what I found on this blog.. Thanks

  14. For me the following solution works: plg_authentication_joomla in the table extensions, to enabled=1

  15. Thanks a lot. Helpful blog

  16. Thanks you so much guys.... Great work

  17. My problem was solved and I just had to change access from 0 to 1:
    find this record and change the bold items to these values:
    extension_id 401
    name plg_authenticat ion_joomla
    enabled 1
    access 1
    protected 1

  18. I discount the same issue finally was resolved by following the advice of you.Thanks

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