TLS defines the alert protocol and alert code 21 means "Decryption failed", 
see: http://en.wikipedia.org/wiki/Transport_Layer_Security#Alert_protocol

Quoting wikipedia: 


*"This record should normally not be sent during normal handshaking or 
application exchanges. However, this message can be sent at any time during 
the handshake and up to the closure of the session. If this is used to 
signal a fatal error, the session will be closed immediately after sending 
this record, so this record is used to give a reason for this closure. If 
the alert level is flagged as a warning, the remote can decide to close the 
session if it decides that the session is not reliable enough for its needs 
(before doing so, the remote may also send its own signal)."*

So it can happen at any time. I guess you have to check log files (maybe 
increase log level) and maybe its worth a try to check if other TLS alerts 
are send before code 21 occurs. Might gives you hints about whats going 
wrong.

>From a GWT point of view you can not do anything about it. You can only 
create a new connection to the server but that does not solve your problem.

-- J.

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