Look at this page http://www.stunnel.org/faq/stunnel.html#configuration_file
In service level options section, under the explanation of "CRLpath" it is said that all files in it should be of the form XXXXXXXX.0. But my stunnnel setup worked only when i names as XXXXXXXX.r0 instead of XXXXXXXX.0.

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Sandeep Kumar
http://students.iiit.ac.in/~sandeep_kr