Can't upload MP3 / MP4 files

When uploading mp3 or mp4 files if you encounter the follwoing error; "Unable to open i/o files", there are a few things that you need to check to ensure that you can upload these filetypes:

  1. Check that you have not deleted mp3 / mp4 file extensions in DOCman's settings (Components > DOCman > Settings > Allowed file extensions). By default DOCman allows both mp3 and mp4 files to be uploaded.
  2. Make sure that you have sufficient disk space to store the files and that the file permissions are correctly set (CHMOD 0644)
  3. If you have a firewall extension installed on your Joomla site (e.g. RSFirewall), check that mp3 and/or mp4 filetype extensions are not in the banned list.