check out not working

[Makoshark]

I have a problem with not being able to get to step one on check out http://shop.nilandsplsce.com. It keeps asking for login. I have two sites and have check to see if they are set up right. the one at http://nilandsplace.com/Shop seems to be ok. I am wondering if it has anything about how I modified my includes/configure.php
I have it set as;
// Define the webserver and path parameters
// HTTP_SERVER is your Main webserver: eg-http://www.your_domain.com
// HTTPS_SERVER is your Secure webserver: eg-https://www.your_domain.com
define('HTTP_SERVER', 'http://shop.nilandsplace.com');
define('HTTPS_SERVER', 'https://shop.nilandsplace.com');

// Use secure webserver for checkout procedure?
define('ENABLE_SSL', 'true');
this should work?

[Makoshark]

I have a problem with not being able to get to step one on check out http://shop.nilandsplsce.com. It keeps asking for login. I have two sites and have check to see if they are set up right. the one at http://nilandsplace.com/Shop seems to be ok. I am wondering if it has anything about how I modified my includes/configure.php
I have it set as;
// Define the webserver and path parameters
// HTTP_SERVER is your Main webserver: eg-http://www.your_domain.com
// HTTPS_SERVER is your Secure webserver: eg-https://www.your_domain.com
define('HTTP_SERVER', 'http://shop.nilandsplace.com');
define('HTTPS_SERVER', 'https://shop.nilandsplace.com');

// Use secure webserver for checkout procedure?
define('ENABLE_SSL', 'true');
this should work?

when trying to checkout the zencart goes to login screen even though I had just loged in, so I login again and select check out and it brings me back to login