Thanks for your answer Jens, I am new to GWT so I don't know if my next 
question is doable or not.  From logs I can see that the service is still 
running on the server after I get the alert message. So when I detect this 
error can I go back and restart another callback that will wait again for 
the original RPC to finish. If this is possible can you give me a high 
level idea on how it would be done.  Thanks for your help.

On Monday, February 24, 2014 10:24:46 AM UTC-7, Jens wrote:
>
> 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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