Joomla Version 1.5.23 login problem

I am using Joomla Version 1.5.23 for my back end. I created a component called COM_DIRECTORY. I am using three kind of users. like superadmin,开发者_如何学Pythonsales person, advertisers person. if i login with sales person username and password , it will enter perfectly and if i click any link on my com_directory., it automatically logging out. Again if i use same use name and password and clicking the link it works fine. Please resolve this

Look if your links have www in the beginning of the link. If they do not, you must use .httacces file to rewrite them.

put this in your .httacces file:

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

Dont forget to change yourdomain to your domain :)