The DataHub program currently uses TLS version 1.3 by default for both outgoing and incoming connections. The SSL libraries are upgraded as needed to maintain security against all known TLS attack vectors. The DataHub program will use TLS 1.0, TLS 1.1, or TLS 1.2 if the other participant in the connection requires it.

If you are connecting different versions of the DataHub program, at some point you may discover that a DataHub instance using an older version of SSL is no longer compatible, and cannot connect to a DataHub instance that uses a newer version of SSL. Should this happen, we encourage you to upgrade all DataHub instances to the latest release.

However, we realize that upgrading existing installations is not always an option. In these cases it may be possible to configure a tunnel connection by modifying the SSL security level of the newer version of the DataHub program. This can be done by adjusting the OpenSslOptions registry entry as described in Editing OpenSSL ciphers and options.