Hi,
I have a wp-cron.php with a 403 forbidden response as well.
I have tried this without success: http://ww.wp.xz.cn/support/topic/403-forbidden-response-backupwordpress?replies=2#post-3346816
Everytime I try step 6. (update file) I am sent back to the website’s home page.
I would rather not play with wp-config, is there another way?