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Help Center/ TaurusDB/ Troubleshooting/ Connection Issues/ SSL Connection Failed Due to Inconsistent TLS Versions

SSL Connection Failed Due to Inconsistent TLS Versions

Updated on 2024-12-30 GMT+08:00

Scenario

A client failed to connect to a cloud-based TaurusDB instance using SSL, but could connect to a self-managed database using SSL.

Possible Causes

Troubleshooting:

  1. View error logs of the TaurusDB instance.
    2021-07-09T10:30:58.476586+08:00 212539 [Warning] SSL errno: 337678594, SSL errmsg: error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol2021-07-09T10:30:58.476647+08:00 212539 [Note] Bad handshake2021-07-09T10:32:43.535738+08:00 212631 [Warning] SSL errno: 337678594, SSL errmsg: error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol2021-07-09T10:32:43.535787+08:00 212631 [Note] Bad handshake2021-07-09T10:50:03.401100+08:00 213499 [Warning] SSL errno: 337678594, SSL errmsg: error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol2021-07-09T10:50:03.401161+08:00 213499 [Note] Bad handshake2021-07-09T10:53:44.458404+08:00 213688 [Warning] SSL errno: 337678594, SSL errmsg: error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported protocol2021-07-09T10:53:44.458475+08:00 213688 [Note] Bad handshake
  2. According to unsupported protocol in the error information, the problem may be related to the TLS version. Run the following command to check the TLS versions of the TaurusDB instance and self-managed database:

    show variables like '%tls_version%';

    It was found that the TaurusDB instance used TLS v1.2 and the self-managed database used TLS v1.1. The TLS version of the client was the same as that of the self-managed database. As a result, the self-managed database was successfully connected, but the TaurusDB instance failed to be connected.

Solution

Upgrade the TLS version of the client to TLS v1.2.

If the official JDBC driver mysql-connector/J is used, see Connecting Securely Using SSL for the configuration method.

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