I am the administrator of four Moodle installations in the same shared hosting. Suddenly, none of them allow uploading file, but before all of them work perfectly. Now, the icon is spinning all the time, as you can see in the attached image.
I have checked everything: upload limits in php.ini, claw av deactivated, moodledata forlder permissions (777), yui deactivated,etc.
When I open the Chrome console, after selecting the file to upload and click on "upload this file", it makes a connection with repository_ajax.php?action=upload and after it receives a "403 Forbidden" error. The Moodle's debugging options does not give any informacion. I think it has to be some problem with the hosting configuration, because the error is the same in all the installations (2.9.9 and other versions), in the same server. Perhaps some Apache security option? Before talking with the hosting support staff I would like to ask if anyone has a solution.