Can't login admin page after upgrade from 1.9.2.1 to 1.9.2.2

Question

Can't login admin page after upgrade from 1.9.2.1 to 1.9.2.2 After entering address: "index.php/admin" redirects me to default 404 error store page. I cleaned Magento Cache and browser. Redirects work properly on all web pages of store. It does not work only "admin" Please help solve this problem.

Answer 1

Magento 1.9.2.2 included supee-6788 patche in this version in order to improve magento security purpose.

In this version,magento have change url pattern for custom module which are used at admin.

see detail at

https://magento.com/security/patches/supee-6788-technical-details

How to check which modules are affected by security patch SUPEE-6788

As per as,my concept may custom route is created issue ,you need change it procees. For example the following config.xml file for a module:

<admin>
    <routers>
        <custom_module>
            <use>admin</use>
            <args>
                <module>custom_module</module>
                <frontName>custom_module</frontName>
            </args>
        </custom_module>
    </routers>
</admin>

Should be changed to:

<admin>
    <routers>
        <adminhtml>
            <args>
                <modules>
                    <custom_module after="Mage_Adminhtml">CustomModule_Adminhtml</custom_module>
                </modules>
            </args>
        </adminhtml>
    </routers>
</admin>