I made a copy of Drupal6 site with SecurePages module installed and configured. This module is configured to redirect all or certain pages to https - depending on your configurations. For our setup we usually include the login and admin sections to redirect to https.

The problem is on the copied site that is on a new domain as we cannot login and go to the admin section because it redirect back to the source/original site. What we need is either disable the securepages module or update the domains. To do this, you need to access your database (ex: phpmyadmin, etc), go to variable table, and search for securepages configurations.

If you want to disable the module change:

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securepages_enable  s:1:"**1**";

to

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securepages_enable  s:1:"**0**";

Or if you want to update the domain change:

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securepages_basepath s:30:"http://**www.domain.com**";
securepages_basepath_ssl s:31:"https://**www.domain.com**";

to

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securepages_basepath s:30:"http://**www.newdomain.com**";
securepages_basepath_ssl s:31:"https://**www.newdomain.com**";

After making the above changes don’t forget to run the update.php (http://www.newdomain.com/update.php)

If you want to uninstall the module, try removing the securepages directory and run update.php.