text: Title: Difficult response after request from an TLS client which not supporting TLS SNI 
  Body: We did some tests with `openssl s_client -connect 23.23.115.5:443` to simulate our embedded client.
  We can't get an connection successfully with this method and got always "Internal_error" . After digging deeper we found  `openssl s_client -connect 23.23.115.5:443 -servername www.httpbin.org` is working fine.
  
  The https://tools.ietf.org/html/rfc6066 states:
  
  > If the server understood the ClientHello extension but does not recognize the server name, the server SHOULD take one of two actions: either abort the handshake by sending a fatal-level unrecognized_name(112) alert or continue the handshake.
  
  It would be very nice to change the response to "unrecognized_name" instead of "Internal_error"
  This will help others to find the root cause much faster ;-)