#load balanced

Magento doesn’t handle SSL certificates on load balanced servers very well.

Fix it with this. 

.htaccess

... SetEnvIf X-Forwarded-Proto "^https$" HTTPS=on

And stick this in index.php, before the Mage::run line

foreach (array(    'SERVER_PORT' => 443,    'HTTP_X_FORWARDED_PROTO' => 'https',    'HTTP_CF_VISITOR' => '{"scheme":"https"}' ) as $key => $value) {    if (isset($_SERVER[$key]) && $_SERVER[$key] == $value) {        $_SERVER['HTTPS'] = 'on';        $_SERVER['SERVER_PORT'] = 443;        break;    } }