I have done the following:

-- Installer WordPress and enabled MU on the main site (main.com).

-- Changed wp-config.php of the MU to the following:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^(wp-(content|admin|includes).*)  [L]
RewriteRule ^(.*\.php)$  [L]
RewriteRule . index.php [L]

-- Changed the second domain (second.com)'s nameservers to be the same as the main domain. Then I added the second domain as an addon domain in cPanel. For web root of the second domain I choosed htdocs/main.com (the directory where WP MU is installed).

I didn't just park it, because the WordPress MU is not installed in the root directory of the cPanel account and I am using shared hosting.

-- Installed the WP domain mapping plugin: http://wordpress.org/plugins/wordpress-mu-domain-mapping/

-- Went to the Network admin in the main site and under Settings->Domain mapping, I've entered main.com in the "Server CNAME domain:" fields.

-- Under Settings->Domains I've added the domain second.com as the main domain for the WP install with ID 2.

-- Under Sites->All Sites I've edited site with ID 2 and changed its domain to be http://second.com, keeping the checkbox "Update siteurl and home as well." checked.

Now when I visit second.com in my browser I simply get redirected to the main WP site - main.com, whereas it should show me the WordPress child site instead.

Maybe the same issue i had a few days ago. Under each site's setting, you should switch the domain to second.com. (Each site's has a domain mapping settings too, where the default is main.com/second, and if you added the other domain to site on the network administration, it should appear the option to choose the second.com)

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