How to resolve the issue of establishing a secure connection error in SQL Server?

When establishing a secure connection on SQL Server, you may encounter the following error:

1. SSL security certificate error: This issue may be caused by an invalid or expired SSL certificate on the server. The solution is to update the server’s SSL certificate or use a valid one.
2. The error of TLS/SSL protocol version mismatch between the client and server may be resolved by ensuring both are using the same version, or updating their software to support compatible versions.
3. The client or server is not properly configured for TLS/SSL: This error may be caused by the client or server not being properly configured for TLS/SSL. The solution is to ensure that both the client and server are correctly configured for TLS/SSL and using the correct certificates and encryption algorithms.
4. Firewall or network settings issue: This error may have occurred due to a firewall or network settings blocking secure connections. The solution is to ensure that the firewall and network settings allow traffic for secure connections to pass through.
5. SQL Server configuration issue: This error may be caused by configuration problems in SQL Server. The solution is to check SQL Server’s configuration, ensure that secure connection options are enabled, and that certificates and encryption algorithms are correctly configured.

If the above methods do not solve the problem, it is recommended to consult the official documentation of SQL Server or contact technical support for more detailed assistance.