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* TLS overhaul, bumping version to 6.4Matthias Andree2015-01-261-0/+37
Removes SSLv2, enables TLSv1.1 and v1.2 more easily, permits SSLv3 (only if specified) and newer TLSv1.1+ for STLS/STARTTLS. Only negotiates TLSv1 and newer by default, SSLv3 must now be specified explicitly, as a consequence of the POODLE attack. This is meant to be a minimally upgraded version, and cannot be usefully done as a 6.3.X release. It is strongly recommended that users review their configuration - especially --sslproto - per instructions in the NEWS file and manual page. It has changed semantics and in many cases --sslproto auto or perhaps --sslproto tls1.2+ should be used now.