Joomla back-end needs two times login? Why? [duplicate]

Question

This question already has answers here:

Why do i have to log in twice in backend to log in? (2 answers)

Closed 8 years ago.

My login problem is reproducable on different Joomla sites. I have this for a Joomla version 2.5.9 and 3.2.

Backend users need to put my username and password in twice to get logged in.

Are some users experiencing the same? Can someone explain this?

First login at: http://my-domain.com/administrator/ For some reason, nobody can login here. This page get redirected to the second page:

Second login at: http://www.my-domain.com/administrator/ Login is possible here.

So, I need a WWW in the URL. But some users keep going to the other page. Is this Joomla related? Hosting partner related?

On my other website, I have the reverse problem.

Login at: http://www.other-domain.com/administrator/ does not work.

Login at: http://other-domain.com/administrator/ is the redirect page and works.

There is one post with a user having the same problem, but I did not find the usefull answers: http://forum.joomla.org/viewtopic.php?t=558305

Thanks! Any help or explanation is useful. I realy need this explanation for my customers.

Answer 1

The login problem was related to my domain configuration and the interaction with Joomla.

I updated the .htaccess file like:

RewriteCond %{HTTP_HOST} ^domain\.com [NC]
RewriteRule ^(.*)$ http://www.domain.com/$1 [R=301,L]

In this way, my users always get redirected to: www.domain.com Even coming to domain.com

This give them direct access, but is also beter for other plugin's and modules that use web-cloud services, depending on the www.domain.com (they will not work on domain.com) Examples: Social Login with Google/Facebook/Twitter; Map API's and other API's

I hope this will help some users! It helped me :-)

Answer 2

This can be caused through a conflict between a redirect in the .htaccess settings and the $live_site parameter in the configuration.php file.

For example, the $live_site parameter in configuration.php may be set to the non-www version of the website while a redirect in the .htaccess file may be redirecting the www version of the website or vice versa.

Either make these consistent or don't set the $live_site parameter. Setting the $live_site parameter is usually not required for a website in the root folder on properly configured hosting unless there is a particular requirement (e.g. sh404SEF or similar).