WordPress MU

Steps which I followed (I tried several times):
1. Copied WPMU on mydomain.com (mod_rewrite is enabled).
2. Run mydomain.com/wpmu, installation screen appeared.
3. Selected sub-domains blog addresses.
5. Added database name and login info (my DB host is not "localhost" but "mysql401.ixwebhosting.com").
4. Added server address as mydomain.com
5. Added email as webmaster@mydomain.com
6. Clicked on "Submit", received "Installation Finished! Congratulations!" and also an email message telling me that the WPMU is installed on mydomain.com/wpmu/ and that I can log in at mydomain.com/wpmu/wp-login.php
7. Now, when I'm opening mydomain.com/wpmu/ or mydomain.com/wpmu/wp-login.php addresses, I receive the following error: "No WPMU site defined on this host. If you are the owner of this site, please check Debugging WPMU for further assistance."

Reading this forum I understood that others had the same error BEFORE installing WPMU, but I receive it AFTER! I checked also my database, NO tables were created there.

Please help a dummy! :(

Other information from wp-config, which was created of course automatically and I didn't change nothing inside it:
...
define('VHOST', 'yes');
$base = '/wpmu/';
$table_prefix = 'wp_';
define ('WPLANG', '');
define( "WP_USE_MULTIPLE_DB", false );
define('ABSPATH', dirname(__FILE__).'/');
require_once(ABSPATH.'wp-settings.php');

Did you read the readme and follow the steps there?

andrea_r, yes, I did.
I read also here: http://codex.wordpress.org/Installing_WordPress
Still confused about this error. Any ideas?

I am confused. You want it on mydomain.com or mydomain.com/wpmu/ ? ? ?

You told it that you want it on mydomain.com so you need it installed at mydomain.com and not mydomain.com/wpmu/

I am not sure, but that doesn't look like it will work especially since you told it to use subdomains

Trent

Trent, I tried to install directly on root. Exactly the same behavior, the error still appears.

MU sometimes has issues when the db server is not on localhost.