I’m behind a firewall that asks me to enter credentials before letting me access internet. So my first http request is intercepted and then redirected to a secure server that prompts me to enter my credentials. So I get response with following headers, when I send a get request to google.com
172.24.64.1 is the server in question.
Connection close
Content-Length 225
Cache-Control no-cache
Content-Type text/html
Location https://172.24.64.1:1005/x?70cea2e7d3de9b77
I then get hold of the Location header of the response that redirected me, and then try to establish a connection with the server with invalid certificate.
HttpWebRequest loginRequest = (HttpWebRequest)HttpWebRequest.Create(location);
However, loginRequest.GetResponse() fails with the exception message: “the underlying connection was closed. Could not establish trust relationship for the SSL/TLS secure channel”
I then put this line in my code before the line asking for HttpWebResponse:
Using a self-signed certificate with .NET's HttpWebRequest/Response
ServicePointManager.ServerCertificateValidationCallback = delegate{return true;};
However, I get the following exception:
The remote server returned an error: (401) Unauthorized.
However, I don’t see any authentication request in the aforementioned headers. So I don’t understand what the problem is. Can somebody please suggest what I should do in this situation.
The 401 indicates that the connection succeeded, but it’s now challenging you for authentication credentials, probably via NTLM/Negotiate. You’ll need to attach a credential for your web request to automatically authenticate. (see HttpWebRequest not passing Credentials for instance)
You can use Fiddler (www.fiddler2.com) to watch this traffic and understand what’s happening.