I was getting a 403 on cron jobs for Akeeba Backup and Acymailing. The Akeeba cron also had a separate problem of the key not matching, with help from the support here.
I also had an ajax script running with Mosets Tree to query the database for duplicate listing names when filling out the new listing forms. This also stopped working and was throwing a 403 when checking in the Chrome console.
These both problems started when I installed admin tools. I have traced it to the htaccess, I disabled the htaccess created by admin tools and reverted to the default file and both the acymailing cron (there is a cron message in the config of acymailing) and the ajax call started working. I re-enabled the admin tools htaccess to check - and both processes stopped functioning, the cron not running and the ajax call not working.
I do not wish to completely remove the admin tools version of the htaccess file but I am not sure what rules are blocking the above two processes.
Have you some suggestions or can I attach the file for you to look at.
Thank you for your assistance
Steve