Wordpress admin login cookies blocked error after

Question

Background: had a working Wordpress 3.7 site at olddomain.com.

I moved it to newdomain.com successfully, and in the process added this to wp-config:

define('WP_HOME','http://newdomain.com');
define('WP_SITEURL','http://newdomain.com');

Now when I attempt to login from newdomain.com/wp-admin I'm getting the cross-browser error (despite having cookies enabled and clearing existing cookies):

ERROR: Cookies are blocked or not supported by // your browser. 
You must enable cookies to use WordPress.

I tried going into wp-login.php and commenting out the following lines (744-747) to stop the conditional testcookie check

    // If cookies are disabled we can't log in even with a valid user+pass
if ( isset($_POST['testcookie']) && empty($_COOKIE[TEST_COOKIE]) )
    $user = new WP_Error('test_cookie', __("<strong>ERROR</strong>: Cookies are blocked or not supported by // your browser. You must <a href='http://www.google.com/cookies.html'>enable cookies</a> to use WordPress."));
else
    $user = wp_signon('', $secure_cookie);

but doing that leaves me stuck in a redirect loop back to the admin page:

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

Do I need to change (or not set) the site URL? or is there another potential way to troubleshoot this? thanks

Answer 1

I had the same problem and nothing works. After upgrading my php 5.3.x to 5.4.x it works fine.