title: SSL certificate failed for twitteR in R
body: <p>I know similar questions have been asked again. However, I've tried everything I found here and on google and nothing seems to work for me.</p>
  
  <p>My code is the following:</p>
  
  <pre><code>reqURL &lt;- "http://api.twitter.com/oauth/request_token"
  accessURL &lt;- "http://api.twitter.com/oauth/access_token"
  authURL &lt;- "http://api.twitter.com/oauth/authorize"
  consumerKey &lt;- "xxxxxxxxxxx"
  consumerSecret &lt;- "xxxxxxxxxxxxxxxxxxx"
  twitCred &lt;- OAuthFactory$new(consumerKey=consumerKey,
                           consumerSecret=consumerSecret,
                           requestURL=reqURL,
                           accessURL=accessURL,
                           authURL=authURL)
  twitCred$handshake(cainfo = system.file("CurlSSL", "cacert.pem", package = "RCurl"))
  registerTwitterOAuth(twitCred)
  </code></pre>
  
  <p>Here I get:
  <code>[1] TRUE</code></p>
  
  <p>But if I try this:
  <code>tweets = searchTwitter('blabla', n=1500)</code></p>
  
  <p>I get the following error:
      <code>[1] "SSL certificate problem, verify that the CA cert is OK. Details:\nerror:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed"
  Error in twInterfaceObj$doAPICall(cmd, params, "GET", ...) : 
    Error: SSL certificate problem, verify that the CA cert is OK. Details:
  error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed</code></p>
  
  <p>Here are the packages and versions on my PC:</p>
  
  <blockquote>
    <p>sessionInfo()
        R version 2.15.1 (2012-06-22)
        Platform: i386-pc-mingw32/i386 (32-bit)</p>
  </blockquote>
  
  <pre><code>locale:
  [1] LC_COLLATE=Greek_Greece.1253  LC_CTYPE=Greek_Greece.1253   
  [3] LC_MONETARY=Greek_Greece.1253 LC_NUMERIC=C                 
  [5] LC_TIME=Greek_Greece.1253    
  
  attached base packages:
  [1] stats     graphics  grDevices utils     datasets  methods   base     
  
  other attached packages:
  [1] ROAuth_0.9.2   digest_0.6.2   twitteR_1.1.0  rjson_0.2.12  
  [5] RCurl_1.95-4.1 bitops_1.0-5  
  
  loaded via a namespace (and not attached):
  [1] tools_2.15.1
  </code></pre>
  
  <p>Any help would be really useful!!</p>