Note: You are currently viewing documentation for Moodle 2.8. Up-to-date documentation for the latest stable version of Moodle may be available here: error/moodle/invalidsesskey.


From MoodleDocs

Some reasons why you might have got an "Invalid Sesskey" message are:

  1. Your site doesn't have the PHP setting "sessions.autostart=0" (see Installing Moodle - software)
  2. You logged out at some time between opening the form and submitting it.
  3. You have followed a bad link to a form script.
  4. Your database has an incorrect value for sessioncookiepath in the mdl_config table.
  5. You edited the code in a file on the server while logged in to your moodle website.

See also