!!! Overview
[{$pagename}] is defined in [RFC 7507] and provides for a work around interoperability problems with legacy servers, many [TLS] [user-agent] implementations do not rely on the [TLS] protocol version negotiation mechanism alone but will intentionally reconnect using a downgraded protocol if initial handshake attempts fail.  Such [user-agent]s may fall back to connections in which they announce a version as low as [TLS 1.0] (or even its predecessor, Secure Socket Layer (SSL) 3.0)  as the highest supported version.

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]