wp-admin Redirected To Error 404 Page After WordPress Upgrade
Have you encountered wp-admin page being redirected to Error 404 page after your WordPress upgrade?
Last 2 days, I almost went crazy when I found out that I couldn’t login to my WordPress blog anymore even though had successfully upgraded to WordPress 2.9.2. Every time i went to the wp-admin page, it was being redirected to error 404 page.
I did try to get help from WordPress Support Forums and BlogCatalog but luck was not with me. At that moment, I really didn’t know what to do already and even thought of rebuilding this blog again. Luckily, I procrastinated the idea and decided to investigate further.
So what I did was that I created a php file named test.php with the following code in it:
<?php phpinfo(); ?>
and then place it one each under root and wp-admin folder. What happened was that the test.php was working fine under the root folder but NOT for the wp-admin folder. Ah-hah! This had at least given me some hints why I was not able to access any php files inside of wp-admin folder. Then I proceeded to creating a temporary folder, for example called ‘testphp’ under root and copy the test.php into it to test if the php file was working fine. Yes, it worked! At that moment, I had the strong feeling that I could identify the root cause of the problem.
What I did after that was I compared the permission between ‘testphp’ of the wp-admin folders. Guess what, I discovered that the permission between the 2 folders were somehow different where ’testphp’ and wp-admin folder were having permission 755 and 777 respectively. I was not sure why permission of wp-admin had been changed to 777 during WordPress upgrade process. Anyway, I proceeded to changing the permission from 777 to 755. Bingo! It has started to work again and I have a sigh of relief.
Just in case you encounter almost the same kind of problem as I described above in the future, please be sure to check if the permission of the wp-admin folder is set to 755 before proceeding to finding out other potential root cause such as file permission, corrupted/missing files and so on.
Thanks for reading my long winded story!
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