Magento can’t login to admin Warning: Header may not contain more than a single header, new line detected

by Posted on

The first step that you should do to resolve this bug is check your system.log file.
In my case error looks like this:
Warning: Header may not contain more than a single header, new line detected in D:\Zend\Apache2\htdocs\project1\app\code\core\Mage\Core\Model\Session\Abstract\Varien.php on line 123
Warning: Header may not contain more than a single header, new line detected in D:\Zend\Apache2\htdocs\project1\app\code\core\Mage\Core\Model\Cookie.php on line 307
Warning: Header may not contain more than a single header, new line detected in D:\Zend\Apache2\htdocs\project1\app\code\core\Mage\Core\Model\Cookie.php on line 308
Warning: Header may not contain more than a single header, new line detected in D:\Zend\Apache2\htdocs\project1\app\code\core\Mage\Core\Model\Session\Abstract\Varien.php on line 436

Problem should disappear, after change value of web/cookie/cookie_domain in core_config_data table, or just delete it.

Published by Adrian Badowski