Unable to connect to the remote server

Hi, 

In my local machine every is working fine, but the same went to live i am getting the error like "Unable to connect to the remote server".

public LoginResultResponse Login(string UserName, string Password, string BaseAddress, string ServerLocation)
{
try
{
this.credentials = new ClarizenCredentials(UserName, Password);
string requestJson = JsonConvert.SerializeObject(credentials);
string responseJson = string.Empty;
string Uri = BaseAddress + ClarizenSession.GetServerDefinition;
rmc.TraceError("ClzHITLogininDLL_3_" + ClarizenSession.BaseAddress.ToString() + "____" + ClarizenSession.GetServerDefinition + "_" + Encoding.UTF8.GetBytes(requestJson).Length + "___" + requestJson);
// string Uri = "https://api.clarizen.com/v2.0/services/authentication/getServerDefinition";
string result1 = CAllRemotingServer(Uri, requestJson);
rmc.TraceError("ClzHITLogininDLL_3_" + result1.ToString());

response = JsonConvert.DeserializeObject<AuthenticateResponse>(result1);

requestJson = string.Empty;
responseJson = string.Empty;

ClarizenCredentials login = new ClarizenCredentials(credentials.Username, credentials.Password);
requestJson = JsonConvert.SerializeObject(login);

if (!string.IsNullOrEmpty(response.ServerLocation.ToString()))
{
Uri =response.ServerLocation + ClarizenSession.Login;
string result2 = CAllRemotingServer(Uri, requestJson);

loginResponse = JsonConvert.DeserializeObject<LoginResponse>(result2);
// rmc.TraceError("ClzHITLogininDLL_3_" + responseJson.ToString());
}

if (!string.IsNullOrEmpty(loginResponse.SessionId))
{
LoginResultResponse ObjLR = new LoginResultResponse();
ObjLR.SessionId = loginResponse.SessionId;
ObjLR.serverLocation = response.ServerLocation;
return ObjLR;
}
else
{
return null;
}
}
catch (WebException Wex)
{
var streamReader = new StreamReader(Wex.Response.GetResponseStream());
string s = streamReader.ReadToEnd();
var response = JsonConvert.DeserializeObject<ErrorMessage>(s);
rmc.TraceError("CLzUpdateTrackStatusinDLL___" + response.Message);
return null;
}
}

private string CAllRemotingServer(string Uri, string json)
{
// string uri = "https://api2.clarizen.com/v2.0/services/authentication/getServerDefinition";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Uri);
request.Method = WebRequestMethods.Http.Post;
request.ContentType = "application/json";
request.ContentLength = json.Length;
// request.Accept = "application/json";
try
{
using (StreamWriter writer = new StreamWriter(request.GetRequestStream()))
{
writer.Write(json);
}
try
{
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
string tmp = reader.ReadToEnd();
return tmp;
rmc.TraceError("inHttpWebRequestnewmethod__respos___" + tmp);
}
}
catch(WebException ex)
{
rmc.TraceError("inHttpWebRequestnewmethod__error___" + ex.Message);
}
}

catch (WebException wex)
{
rmc.TraceError("inHttpWebRequestnewmethod " + wex.Message);
var streamReader = new StreamReader(wex.Response.GetResponseStream());
string s = streamReader.ReadToEnd();
rmc.TraceError("inHttpWebRequestnewmethod " + s);
}
return "";
}

the Code is DLL (Class Library) 

Thank you.,,,