[SOLVED][Drupal CKEditor] CKFinder Browse Server returns Page not found error
Many Drupal users have repeatedly reported that they get a Page not found error when they click on the CKFinder Browse Server button on their Drupal sites. If you also facing the same issue in the CKEditor in your Drupal site then continue reading to get it fixed.
The fix is actually extremely simple. Most hosts do not allow the execution of the files writeable by a group, i.e. files with a permission of 777. The CKEditor and the sub-folders by default has a file permission of 777 which is causing the error. To fix the issue simple change the permission of the CKEditor folder from 777 to 755.
#chmod -R 755 sites/all/modules/ckeditor
Hope that helps.
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Reference: http://drupal.org/node/713724