SSL/TLS

Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols designed to provide communication security over the Internet. [1]

Issues

Due to recently discovered attacks against TLS/SSL (Heartbleed, etc.) many users decide to ban older TLS versions from their server. TLSv1.2 is only supported by Android 4.1 and later. So if you are using an older Android version, you'll have to allow TLSv1 as well. See also: Supported SSL protocols by API level