Magento Admin URL returns 404, after changing <use> xml parameter

Question

I've installed a module which didn't work as expected.

As a fix I tried changing the admin use parameter in the config.xml as i noticed it was the old router coding style.

After changing <use>admin</use> to <use>customadminurl</use> the admin panel is now inacessible. It just returns 404 error page.

    <admin>
        <routers>
            <adminhtml>
                <use>admin</use>
                <args>
                    <modules>
                        <ordercomment before="Mage_Adminhtml">Tech18_OrderComment_Adminhtml</ordercomment>
                    </modules>
                </args>
            </adminhtml>
        </routers>
    </admin>

I've tried to change the routing to the new style without the use parameter, but this didn't fix it.

    <admin>
        <routers>
            <adminhtml>
                <args>
                   ...

I've tried:

• purging cache via n98-magerun
• revert changes
• checking conflicts via n98-magerun
• reindexing
• disabling the module
• Changing admin url to non-custom (default "admin") both in database and local.xml
• Checking rewrites table
• checking all log files
• checking core_config_data for issues
• enabling security, backwards extension compatibility in

( https://marketplace.magento.com/18thtechnology-order-notification-of-creator.html#bv_questions)

Answer 1

It was just a redis cache issue