unable to connect to remote server

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C#

.NET

Hi
I have tried creating a webservice as follows but ended up getting the exception
unable to connect to remote server please check my code and tell me where I went wrong

string url = "https://meet66961131.adobeconnect.com/api/xml?action=common-info";

       HttpWebRequest r = (HttpWebRequest)WebRequest.Create(url);
       r.Method = "Get";
       HttpWebResponse res = (HttpWebResponse)r.GetResponse();
       Stream sr = res.GetResponseStream();
       StreamReader sre = new StreamReader(sr);

       string s = sre.ReadToEnd();
       Response.Write(s);