Network Blogs – Cannot access wp-admin – redirect loop

I have set up a blog network with WP 3 and the main site works fine. I am using subdomains.

The “child” sites set up fine. I do not use the mapping plugin but have changed the site info in wp-config for this line:

Original wp-config line:
define( ‘DOMAIN_CURRENT_SITE’, ‘domain.com’ );

To
define( ‘DOMAIN_CURRENT_SITE’, “. $_SERVER[‘HTTP_HOST’].” );

I also change the the value of Domain, Siteurl, Home, and Fileupload Url to suit to your new domain using the “edit” feature on the site list.

The site works great when calling just the main URL. However, if I try to access the back-end using the Super Admin access or simply try to access it through a call to: https://site.com/wp-admin, the access results in a continous loop to an address as such:

https://siteURL.com/wp-login.php?redirect_to=http%3A%2F%2FsiteURL.com%2Fwp-admin%2F&reauth=1

I am sure this is a simple setting somewhere but I cannot figure it out. I have installed multiple child sites and they all have this issue. So to summarize, I cannot figure out why I cannnot access the wp-admin using a proper user login. It stays in a loop.

Any ideas?