Most of you in this thread probably already know this, but we found out when implementing the EFSnet module... curl has some bugs in it, and some "features" too...
Basically you should be using curl 7.8 or better, but note that shortly after, curl began adding in VERIFYPEER as on by default. The curl certificates file does NOT contain a certificate for EFSnet, so you'll either need to add the EFSnet certificate info, or disable VERIFYPEER by adding the following line:
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
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