Transport Layer Security (TLS/SSL)

All API communications are encrypted with TLS/SSL. The available protocols vary depending on the server's Apache and Sierra versions.

Servers running Apache 2.2.4 and Sierra 2.0 (and higher) offer the following protocols:

• All SSL protocols
• TLS v1

Red Hat Enterprise Linux/CentOS 6+ servers running Apache 2.4.2 and Sierra 2.0 (and higher) offer the following protocols:

• All SSL protocols
• TLS v1
• TLS v1.1
• TLS v1.2

The "S" in "HTTPS" indicates the use of a cryptographic protocol. TLS is the more current Transport Layer Security protocol, while SSL is the older Secure Sockets Layer protocol. The terms are often used interchangeably.