There's an interesting approach to tackling this problem described here: https://www.ietf.org/mail-archive/web/tls/current/msg26385.html https://www.ietf.org/ma

There's an interesting approach to tackling this problem described here: https://www.ietf.org/mail-archive/web/tls/current/msg26385.html https://www.ietf.org/mail-archive/web/tls/current/msg26385.h... Summary: constantly make up new protocol "versions". If everything did this, then middleboxes "that do not allow protocol versions that they do not recognize" will never be functional in the first place.