The underlying connection was closed: Could not establish trust

Question

The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.
Please checkout the following code. I am just trying to login on to the web service. I have imported the certificate from IE by going to the Ondemand website.
I am using C# VS 2005
public static String Login(String loginUrlString, String userName, String password)
string p = null;
try
ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(MyCertValidationCb);
HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(loginUrlString);
HttpWebResponse myResponse;
myRequest.Method = "GET";
myRequest.Headers["UserName"] = userName;
myRequest.Headers["Password"] = password;
myRequest.AllowAutoRedirect = true;
myRequest.CookieContainer = new CookieContainer();
myRequest.ClientCertificates.Add(X509Certificate.CreateFromCertFile(@"c:\a.cer"));
// Return the response.
myResponse = (HttpWebResponse)myRequest.GetResponse();
// retrieve session id
char[] sep = { ';' };
String[] headers = myResponse.Headers["Set-Cookie"].Split(sep);
for (int i = 0; i <= headers.Length - 1; i++)
if (headers.StartsWith("JSESSIONID"))
sep[0] = '=';
SessionID = headers[i].Split(sep)[1];
break;
myResponse.Close();
p = sep.ToString();
catch (Exception e)
MessageBox.Show(e.Message);
return p;
public static bool MyCertValidationCb(
object sender,
X509Certificate certificate,
X509Chain chain,
SslPolicyErrors sslPolicyErrors)
if ((sslPolicyErrors & SslPolicyErrors.RemoteCertificateChainErrors)
== SslPolicyErrors.RemoteCertificateChainErrors)
return false;
else if ((sslPolicyErrors & SslPolicyErrors.RemoteCertificateNameMismatch)
== SslPolicyErrors.RemoteCertificateNameMismatch)
Zone z;
z = Zone.CreateFromUrl(((HttpWebRequest)sender).RequestUri.ToString());
if (z.SecurityZone == System.Security.SecurityZone.Intranet
|| z.SecurityZone == System.Security.SecurityZone.MyComputer)
return true;
return false;
return false;

Answer 1

Hi
Abhilash Francis,
Could you tell us your scenario?  What's your project? Is it a WCF service?
Looks like this is not a code issue.
Just from the error information,
it seems that you do not configure the service certificate very well so as to Server was unable to process request.
I am not completely sure  what the real scenario is, but it might be a problem of that It is a WCF services application,  please check these following articles to configure the service certificate.
If not, please feel free to let me know.
How to: Configure an IIS-hosted WCF service with SSL
Could not establish trust
relationship for the SSL/TLS secure channel
Hope this helps.
Best regards,
Kristin
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
Click
HERE to participate the survey.