Fixed: Magento 2 Backend Not Working (updated)

Hello, Magento Buddies!

As against Magento 1, Magento 2 is more robust and comes with a splendid layout and design and an orderly user interface. Despite that, admins face many difficulties in the backend.

Nevertheless, we will be thoroughly diving into the problems confronted by the admin users in the backend administration of Magento 2 and will aim to solve each one of those troubles entirely in this tutorial blog. Also, catch a glimpse of this blog. It will be of much help – How to Fix 404 Error Page Not Found in Admin URL in Magento 2.

So, why are we biding the time? Let’s start!

Fixed: Magento 2 Backend Not Working

Problem 1: After Update or Migration to Magento 2

If the backend gets inoperative after you have updated or you have migrated to the Magento 2 store, then you can apply the following SQL command:

Solution:

SET FOREIGN_KEY_CHECKS=0;

UPDATE 'store' SET store_id = 0 WHERE code='admin';

UPDATE 'store_group' SET group_id = 0 WHERE name='Default';

UPDATE 'store_website' SET website_id = 0 WHERE code='admin';

UPDATE 'customer_group' SET customer_group_id = 0 WHERE customer_group_code='NOT LOGGED IN';

SET FOREIGN_KEY_CHECKS=1;

Problem 2: After Installing or Upgrading New Third Party Module

You might encounter an error message after installing an extension or upgrading to a new third-party module. In that case, the solution is to flush the Magento 2 cache using the terminal. Include the below-given code:

Solution:

php bin/magento cache:clean 

php bin/magento cache:flush

rm -rf var/cache/* 

rm -rf var/generation/*

OR

rm -rf generated/* (For Magento 2.1.8 After)

Problem 3: Due to Wrong Admin URL

It can be a case that you have been stressing to arrive at the backend with an incorrect URL. for that you can get the correct Admin URL with the help of the below command:

Solution:

php bin/magento info:adminuri

Problem 4: User reset the permission role of your administrator

Perform the below steps to solve this problem:

Solution:

Step 1: Go to the Admin Panel -> Systems -> Permission -> User Roles

Step 2: Select the role name that needs to be edited, e.g. ‘Administrators’

Step 3: Switch to the ‘Role Resources’ menu

Step 4: Set the ‘Resource Access’ to ‘All’;

Step 5: Save the role and clear Magento 2 cache after the settings are completed.

Problem 5: New Install on Ubuntu/Centos/Debian

Sometimes, when you install Ubuntu/Centos/Debian then you might get an error message showing “Not Found”.

Solution:

For Ubuntu Users, modify the file /etc/apache2/apache2.conf 

In order to edit this file, run the below-given command:

sudo vi /etc/apache2/apache2.conf

Modify from:

<Directory /var/www/>

Options Indexes FollowSymLinks

AllowOverride None

Require all granted

</Directory>

To:

<Directory /var/www/>

Options Indexes FollowSymLinks

AllowOverride All

Require all granted

</Directory>

After changing the above code, add the below command to restart Apache :

sudo a2enmod rewrite

sudo service apache2 restart

Problem 6: Due to Production Mode

if Magento 2 production mode so reset the production mode again via the Command line. check below :

Solution:

php bin/magento deploy:mode:show

If the currently applied mode is production so run below the command :

php -dmemory_limit=-1 bin/magento deploy:mode:set production

Problem 7: Incorrect Admin URL

Error: The account sign-in was incorrect or your account is disabled temporarily. Please wait and try again later.

if the above error gets then run the below command :

Solution:

php bin/magento admin:user:unlock user-name

Otherwise, you can create a new admin user using following command:

php -dmemory_limit=-1 bin/magento admin:user:create --admin-user="admin" --admin-password="admin@123" --admin-email="test@gmail.com" --admin-firstname="admin" --admin-lastname="tester"

Problem 8: This is not Implemented

Issue: This is not implemented, as it is not possible to implement Argon2i with acceptable performance in pure-PHP (create a user in terminal)

This error occurs with Magento 2.4.2 when PHP does not include the sodium PHP extension You can check if this extension is installed with the below command :

Solution:

php -i | grep sodium

Output :

sodium support => enabled

libsodium headers version => 1.0.16

To fix this problem install/activate the sodium php extension.

For Server in php.ini add (or uncomment)

extension=sodium;

Or

sudo apt-get install php-libsodium

NOTE: the supported PHP version for Magento 2.4 is PHP 7.4

Winding Up!

Hence, the above-mentioned were the possible problems of the Magento 2 Backend Not Working. And we have given the solutions to the respective problems. Send this article to your Magento buddies. In case you encounter any problems in applying the codes, reach out to us through the comments below.

Happy Reading!