[TLS] Lost last DTLS Flight

[Robin Seggelmann <seggelmann at fh-muenster.de>]

We're still working on DTLS for SCTP and stumbled over a problem with  
the last flights specified in RFC 4347. The server receives flight 5  
(Certificate, ..., ChangeCipherSpec, Finished) from the client,  
changes its state to FINISHED and sends its ChangeCipherSpec and  
Finished (Flight 6). What happens if this flight gets lost? The  
server already is in the FINISHED state and as there also is no  
acknowledgement, so it won't be retransmitted. Hence, the client  
keeps waiting for the flight to arrive and the connection is most  
likely to fail.

Regards,
Robin
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