Hi
Imed Bounab •,
Welcome to Microsoft Q&A forum.
As I understand, your Azure Database for MySQL Flexible Server is not available, and connections are timing out.
We are sorry about the inconvenience you are facing.
This is strange and not expected. I would recommend you to please file a support ticket for deeper investigation and in case if you don't have a support plan, do let us know here so that we can check on other options to unblock you. Thanks