Yesterday, after i have asked to my host to fix the issue like you said it seems that the host have worked for me.
So, now the 403 error is disappeared.
I know that Nicholas is been upset about that situation; i'm so sorry. I excuse me!
But now i noticed something else that seems going wrong, i don't know.
This night, my system made a frontend multipart backup via cron job but after that the Akeeba system sent me the stuck backup email.
So, this morning i make a new multipart backup via backend.
The backup is finished, but on the bottom of the page i found a text "Attention".
What happend now?
Could you help me please?
Thanks
I'm going to attach the log files