I found the culprit for my -6753 woes. It was a application named TCPBlock.
It corrected my problem as described here https://discussions.apple.com/message/18379332#18379332
I hope this can help a few who may have this application installed.
BTW, TCPBlock also disabled so functionality in Phase One's Capture One RAW processing software. Strange things happend, but after removing TCPBlock with their uninstall program, my network and photography processing software all work to spec.
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