FixRunner.com explains how you can solve the problem of a 404 Error when logging  into WordPress.

What’s the problem?

You try to log into your WordPress admin panel but you receive a 404 Error page.

How to fix a 404 Error when logging into WordPress

When you receive a 404 Error Login in WordPress, it is a sign that you may need to update your URL in the database. Follow the next steps if you are able to access phpMyAdmin:

Step 1

Login cPanel and navigate to Databases, then click on phpMyAdmin
click on phpMyAdmin - Fix 404 error when logging into WordPress

Step 2

Select your WordPress database, for example: Username_wrdp2.
WordPress database - Fix 404 error when logging into WordPress

Step 3

Go to wp_options and click on Browse.
Go to wp_options and click on Browse - Fix 404 error when logging into WordPress

Step 4

Look for siteurl under the field option_name.

Step 5

Click on Edit Field.
Click on Edit Field - Fix 404 error when logging into WordPress

Step 6

Change the URL in the input box of option_value.
Change the URL in the input box of option_value

Step 7

At the bottom of page, click on the Go button.
click on the Go button - Fix 404 error when logging into WordPress

If you are not able to access phpMyAdmin, try the following steps instead to update your folder attributes:

Step 1

Through FTP, go to the “/wp<-admin” directory
wp-admin - Fix 404 error when logging into WordPress

Step 2

Right click on the wp-admin directory and left click on File Attributes.
Right click on the wp-admin directory and left click on File Attributes

Step 3

Change the value to 755 and check Recurse into subdirectories if there’s an option for that
Change the value to 755 and check Recurse into subdirectories if there’s an option for that

Step 4

Click on OK.
Click on OK - Fix 404 error when logging into WordPress

Step 5

Repeat Steps 1 to 4 for /wp-content and wp-includes.

How Can You Use This Information

The  steps covered above, if followed carefully, should help you fix your 404 error when logging into WordPress. Usually, this issue indicates that you need to edit the url in the database, or to change permissions in your folders.
If you have tried these steps and still encounter problems, you can have one of our developers fix it for you.
Also, if you have tried other steps that solved this issue, please share them with us and our readers.