This question has been answered by multiple community members. See the first response.
<?php phpinfo();
Create a "info.php" file with justGot it. This is the line:
<!--?php phpinfo();
and put it in your site root. Then check to see what directory PHP is using for its session files. Scroll down to the "session" section and look for session.save_path.-->
session.save_path 2;/var/tmp 2;/var/tmp
session.save_path = "/path/to/unrestricted/folder/"