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NSConnection ignores setRequestTimeout: on first request

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NSConnection ignores setRequestTimeout: on first request

Subject: NSConnection ignores setRequestTimeout: on first request
From: "Michael C. Silva" <email@hidden>
Date: Thu, 24 Sep 2009 12:59:11 -0400

I'm using NSConnections (based on NSSocketPorts) for distributed object communications. We just Bonjour to publish NSConnection server availability on the network.

However, if you just disconnect the ethernet from the server machine the Bonjour publish 'lingers' for a bit on the client machine ( this is 'ok' for now).

This leads to a case where our client may try to initiate a new NSConnection to the server side.

We use -[NSConnection setRequestTimeout:] to set a 10s timeout, but in the first message case it seems to ignore this parameter and instead gets hung up by (what I think is) the TCP SYN SENT timeout (60+seconds).

This seems like a problem in NSConnection to me.

Is there a workaround? I've tried using setsockopt for the TCP TCP_CONN_ABORT_THRESHOLD and TCP_CONN_NOTIFY_THRESHOLD parameters, but this seems to have no effect.


Mike
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