Failure on just CAcert could be ownership/permission problems (file vs app). If there is more than one CA in the "certificate chain", then a single CAcert might not succeed. If OS X has "ktrace" (or equivalent), it might help to identify what is being looked for when single CAcert directive is used.
--Quanah
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Quanah Gibson-Mount Principal Software Engineer Zimbra, Inc -------------------- Zimbra :: the leader in open source messaging and collaboration