Jitterbit Harmony supports Transport Layer Security (TLS) 1.2 encryption, with backward compatibility with TLS 1.1 and TLS 1.0.
Using TLS 1.2 may be required in order to meet requirements for some application-specific connectors. For example, starting in September 2019, Salesforce began disabling TLS 1.1 and requiring the TLS 1.2 version (see Salesforce Disabling TLS 1.1).
If you have an older version of a locally installed Jitterbit application, you may need to upgrade the version in order to use TLS 1.2. To check the version you are currently using, see Finding My Jitterbit Version.
These are the minimum Jitterbit versions that support TLS 1.2 and instructions for upgrading: