Here are a few title options, keeping in mind the question format and article\'s focus: Option 1 (Direct & Concise): * Why Do I Get TLS Handshake Errors After Azure SQL Database v12 Upgrade? Op

Azure SQL Database TLS Handshake Failure Post-v12 Upgrade

Users report encountering a TLS handshake failure when attempting to connect to their Azure SQL Database since the v12 upgrade. The error message indicates that the certificate is valid for a specific hostname, but not for the server name attempted for connection.

Troubleshooting:

One potential solution is to modify the connection string. Specifically, the parameters TrustServerCertificate and hostNameInCertificate need to be adjusted as follows:

• TrustServerCertificate=True
• hostNameInCertificate=*.database.windows.net

Why Local Connections Succeed:

The connection string used may not need to be modified for local connections as the TLS certificate would align with the server name being used.

Azure Web App Connection Issues:

In the case of Azure Web Apps, the modified connection string is necessary because the Azure portal suggests setting TrustServerCertificate=False and omitting hostNameInCertificate. However, this configuration appears to cause connection issues after the v12 update.

Tips:

• Ensure the connection string is updated with the appropriate TrustServerCertificate and hostNameInCertificate parameters.
• Verify that the updated connection string is used correctly in your application code.
• If the issue persists, inspect the server logs for additional error information.

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