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If you are encountering an unexpected error while trying to access your Azure MySQL database, it could be due to several reasons. Here are some common troubleshooting steps you can take:

1. Check Firewall Settings: Ensure that your Azure Database for MySQL Flexible Server firewall settings allow connections from your client IP address. You may need to configure the firewall rules accordingly.
2. Connection Time-out: Verify that there are no network issues causing a connection time-out. Ensure that your network is stable and that you can reach the Azure service.
3. Incorrect Login Information: Double-check the username and password you are using to connect to the database. An incorrect username or password can lead to access denial.
4. Maximum Limit Reached: If the maximum limit of connections to the Azure Database for MySQL Flexible Server has been reached, you will need to evaluate and possibly reduce the number of active connections.
5. TLS/SSL Configuration: Ensure that your connection is using the correct TLS version. Azure Database for MySQL Flexible Server requires TLS 1.2 by default, and connections using TLS 1.0 and TLS 1.1 will be denied.

If these steps do not resolve the issue, you may want to check the error logs for more details or consult Azure support for further assistance.

References:

• Troubleshoot connection issues to Azure Database for MySQL - Flexible Server
• Diagnose common connectivity errors