Ken Giusti commented on PROTON-735:

This seems related... I could be wrong.

> SASL authentication failures appear as I/O failures
> ---------------------------------------------------
>                 Key: PROTON-735
>                 URL: https://issues.apache.org/jira/browse/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 
> pn_sasl_outcome.
> 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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