php Curl error: Failure when receiving data from the peer

Question

I had a basic Curl script which basically executed a script on remote server. I was working fine from around 6 months.

Yesterday it stopped working, and was giving back following error.

Curl error: Failure when receiving data from the peer

Would like to know if anyone knows on which condition the curl would returned such error?

Answer 1

When dealing with problem with curl, run it again with:

curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_STDERR,  fopen('php://output', 'w'));

Usually the exact error message is in there somewhere.

Fixed: CURLOPT_STDERR indeed needs a stream resource as @Lübnah states in the comments, and @Roman tried to edit in (although earlier reviewers denied the edit, I've now included it in the answer).