Is Magento 2 backend not working? Solutions for 3 main issues

When installing Magento 2 extensions you can see the Magento connect 404 Error Page Not Found, as Magento 2 Admin Panel (backend) is not working. You can face the issue that Magento 2 admin returns 404 'Page not found' error using NGINX/PHP 7.

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Magento 2 admin page not found

Issue #1: the result of installing or updating

You can see the Magento 404 after install in the following cases:

installing a new extension;
upgrading extension;
applying Magento 2 core or extensions patch.

Solution #1: to fix the Magento 2 404 after install, you need to flush Magento 2 cache

via the Command line

Type in the next command to your Command line:

php bin/magento cache:clean
rm -rf var/cache/*
rm -rf var/generation/*
rm -rf generated/* (for magento 2.2.x)

Issue: the compilation hasn’t been restarted

When installing a new extension in production mode you may forget to restart the compilation. As a result, the Magento 2 backend is not working.

Solution: reset the production mode again via the Command line

Use the command to check if the production mode is activated:

php bin/magento deploy:mode:show

If the currently applied mode is production, run the command:

php bin/magento deploy:mode:set production
to set the mode once again and reset everything from the start.

Issue: an incorrect admin URL

In some cases admin users can apply an incorrect URL to the Admin panel and get the Magento 2 cannot access admin issue with "not found error". For instance, you can use https://magento.com/backend instead of https://magento.com/admin.

Solution: learn the admin URL via the Command line

Run the next command to learn a correct URL leading to the Admin Panel:
php bin/magento info:adminuri

Learn more about Magento 2 Admin URL change.

Issue #2: the permission role is set incorrectly

Due to this issue, you may receive such error in the Magento 2 backend as 404 Error or Page not found error.

Solution #2: to fix the issue with pages in Magento 2 not working after installation, you need reset the permission role of your administrator

Go to the Admin Panel> Systems> Permission> User Roles:

Select the role name that needs to be edited, e.g.: ‘Administrators’;
Switch to the ‘Role Resources’ menu:

Set the ‘Resource Access’ to ‘All’;
Save the role and clear Magento 2 cache after the settings are completed.

Issue #3: just-out installation on Ubuntu, CentOS, Debian…

In this case the ‘Not Found’ message is displayed on the frontend when you try to access a page.

Solution #3: edit the configuration file

E.g.: Ubuntu file /etc/apache2/apache2.conf

use the command:

sudo vi /etc/apache2/apache2.conf

change the piece of code:

<Directory /var/www/>
Options Indexes FollowSymLinks
AllowOverride None
Require all granted
</Directory>

for this one:

<Directory /var/www/>
Options Indexes FollowSymLinks
AllowOverride All
Require all granted
</Directory>

use the command to restart Apache:

sudo service apache2 restart.

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