title: Unknown SSL protocol error in connection to api.twitter.com:443
body: <p>I am getting an error when trying to authenticate using Twitter API in R. </p>
  
  <p>Result of <code>cred$handshake(cainfo = system.file("CurlSSL", "cacert.pem", package = "RCurl")</code>)
  is '<em>Error in function (type, msg, asError = TRUE)  : Unknown SSL protocol error in connection to api.twitter.com:443</em>' </p>
  
  <p>Expected result: It should ask for pin generation in twitter app but instead it is displaying error.</p>