Today i opened my website by browser and found this problem:
Forbidden You don't have permission to access / on this server. Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.
This problem surprised me, because i have done nothing with my website, however, why this problem occured?
To fix this problem, i checked my web host and find the reason:
Becacuse my website was suspended by bandwitdh overused.
So i contacted my web host server and increased my web host bandwidth, and this problem fixed.