Ken Giusti created PROTON-735:

             Summary: SASL authentication failures appear as I/O failures
                 Key: PROTON-735
             Project: Qpid Proton
          Issue Type: Bug
          Components: proton-c
    Affects Versions: 0.8
            Reporter: Ken Giusti
             Fix For: 0.9

Using the current SASL api, an application has to poll the pn_sasl_t object's 
state (pn_sasl_state()) until a terminal state is reached (STATE_PASS/FAIL).
Once the terminal state is reached, the outcome can be queried via 

Unfortunately, when the sasl client receives an authentication failure outcome 
from the sasl server, the sasl layer returns PN_ERR from its input processing 
code.  This causes the pn_transport_push() to return a generic error.

>From the application's point of view, this effectively results in the 
>transport failing -before- the sasl terminal state has been reached.  The 
>application will interpret this event as a generic input failure on the 
>transport - not the authentication failure it actually was.   

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