Magento Connect Manager / 404 Error / Magento 1.9

Question

Path Admin > System > Magento Connect > Magento Connect Manager

What I have tried.

• Searched / read every post I can find on it
• Reset folder and file permissions
• Cleared cache
• Re-indexed everything
• logout / login

I migrated from Debian to Centos 5, not sure what the issue would be.

File Permissions

sudo find . -type f -exec chmod 644 {} \;
sudo find . -type d -exec chmod 755 {} \;
sudo chmod o+w var app/etc
sudo chmod 550 mage 
sudo chmod -R o+w media

Url that shows 404 page

http://my-website.com/downloader/?return=http%3A%2F%2F...

Edit: Magento 404 page - "Whoops, our bad..." page is displayed.

Solved:

I deleted downloader folder and uploaded the one from the previous/debian site and it started working.

Answer 1

This method works for me to fix Magento Connect Manager 404 page not found error:

Change permission of Directory /downloader/ set to 755 and file /downloader/index.php set to 644.

Answer 2

you have to change some magento files permissions. to do that please use this solution of magento-cleanup.php

1. Download it
2. Unzip magento-cleanup.php to the root directory of your magento installation
3. Browse to http://yourdomain.com/magento/magento-cleanup.php
4. it's done!