问题
I am having difficulties authenticating a HttpWebRequest to a webserver. The response I am receiving is simply a 401. I've made sure I set the credentials correctly on the C# side, and IIS is correctly set to allow NTLM authentication. I don't know if this matters, but he computer is not on the same domain as the the web server.
I am sure the user/pass is correct but are there any other authorization settings needed to configure on the user?
If I enable Basic authentication, and disable Windows Authentication, the request works perfectly (with the correct C# code changes of course).
What am I missing?
webRequest.UseDefaultCredentials = false;
webRequest.PreAuthenticate = true;
var c = new NetworkCredential("User", "password", "domain");
CredentialCache credentialCache = new CredentialCache();
credentialCache.Add(new Uri(Url), "NTLM", c);
webRequest.Credentials = credentialCache;
Heres a snapshot of my settings in IIS.
Failed Request Tracing:
回答1:
With the help of a colleague, we were able to determine something was wrong in the way Windows was dealing with the authentication. Looks like a setting in the Local Security was wrong. Changing Local Policies > Security Options > Network access: Sharing and security model for local accounts from Guest only - local users authenticate as Guest to Classic fixed the problem.
回答2:
What is the value of the credential cache lines,
CredentialCache credentialCache = new CredentialCache();
credentialCache.Add(new Uri(Url), "NTLM", c);
why not simply set
webRequest.Credentials = c;
401.2 likely means that either that web server you are connecting to is not enabled to use NTLM (which it seems to be according to your screenshot), or that there is a proxy between your client and the web server
来源：https://stackoverflow.com/questions/9263561/httpwebrequest-401-with-ntlm-authenticiation