Magento admin showing blank page after upgrade

Question

I have upgraded Magento from 1.7.x to 1.9.2.4 using Magento connect.

Now when I open admin panel it's showing blank page, but the frontend is working fine.

I have cleared cache and session but it's still showing blank page.

Answer 1

You need to debug the system as:

1. You can enable printing errors by renaming file local.xml.sample to local.xml . file location magentoRootDirectory/errors/

2. set permissions 777 to magentoRootDirectory/var folder

3. In Index page change the following:

   error_reporting(E_ALL | E_STRICT);

to

error_reporting(E_ALL);

Set $_SERVER['MAGE_IS_DEVELOPER_MODE'] = true

and uncomment this line

#ini_set('display_errors', 1);