Hello folks,

For some reason, a message sent from the REQ side of a REQ/ROUTER isn’t 
arriving.  I know from experience this is some kind of CURVE issue, but I have 
stared at my curve usage for several hours now without seeing the problem.  I’m 
hoping to collect some general strategies on how to debug curve authentication 
issues as I seem to hit problems like this from time to time.

Some notes:

It’s definitely a curve issue, as when I turn off curve authentication on both 
sides everything works fine.
Everybody’s on zeromq-4.0.3
I’m reasonably sure the issue is client-side, as a test client written in 
Python authenticates with the server successfully.
The server’s ZAP handler is never called, so something bad is happening very 
early
I’ve checked the obvious things: the server’s port is open, the client is 
setting all three of ZMQ_CURVE_PUBLICKEY, ZMQ_CURVE_SECRETKEY, and 
ZMQ_CURVE_SERVERKEY to what look like reasonable values
Client and server don’t have any zeromq errors returned during send, receive, 
or setsockopt
Server is running pyzmq on python 3.3 on Darwin, client is a C client built for 
the iPhoneSimulator which is i386-apple-darwin.

An obvious next step is to verify at the TCP level that a connection is being 
established, but I’m not totally sure what I can check that would verify that.

Beyond that I am interested in your thoughts on what I should test.  I really 
think there should be some better errors for CURVE issues as I seem to get 
stuck here a lot.  But for now I will settle for understanding what is wrong…

Drew


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