301 non www to www redirect in Joomla

Go to your .htaccess file in joomla 1.5 if you are using sh404SEF component fo SEF Urls

Find the below line

# # mod_rewrite in use
RewriteEngine On

and write the following code after RewriteEngine On according to your website name

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

So the full code look like:

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


Referred URL: http://www.webmasterworld.com/content_management/3971886.htm

And your website will redirect from http://mysite.com to http://www.mysite.com/

and here is my another research:

For Joomla 1.0
along with the above modification in the .htaccess file.
we need to modify the configration.php file also in the following line:

$mosConfig_live_site = 'http://www.mysite.com';

Remember to keep www (before sitename)

and Above code for perfect redirect i.e.

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

Thats All...