CODEWITHSUNDEEP
c#iissharepointhttp-status-code-401
Joms
Joms

Reputation: 21

401 Authentication error while running C# Application executing HttpWebRequest

I would like to know how can I fix this issue wherein a WebApp running on IIS 7/8 with Windows Authentication is throwing 401 error while executing HttpWebRequest to another site. This WebApp works fine if I run it locally i.e debug mode.

Here is the code snippet

HttpWebRequest webReq;
webReq = (HttpWebRequest)WebRequest.Create("http://sharepoint_site/_vti_bin/listdata.svc/mylist);
webReq.Accept = "application/json";
webReq.UseDefaultCredentials = true;
webReq.Credentials = CredentialCache.DefaultNetworkCredentials;
//webReq.Credentials = new NetworkCredential("user","password","domain");

webReq.Method = "GET";
webReq.KeepAlive = true;
Stream objStream = webReq.GetResponse().GetResponseStream();
StreamReader objReader = new StreamReader(objStream);
HttpWebResponse response = (HttpWebResponse)webReq.GetResponse();

I was also able to make it work by adding BackConnectionHostNames entry in the registry

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0

but I need to pass in the credentials (commented above) which I don't like because I don't want to use my account or any service account.

I want the WebApp to use DefaultNetworkCredentials or DefaultCredentials. I enabled Windows Authentication and NTLM provider on the IIS of the machine hosting this WebApp.

Any help will be greatly appreciated, thanks and more power to this community.

Upvotes: 2

Views: 1154

Answers (1)

Gabriel Luci
Gabriel Luci

Reputation: 40858

CredentialCache.DefaultNetworkCredentials uses the network credentials that the process is running under. If it's running in IIS, it will be the application pool identity, which the web service won't accept.

You will either have to pass different credentials in code (what you said you didn't want to do) or update the application pool to run with network credentials (right-click the application pool in IIS -> Advanced Settings -> Identity)

Upvotes: 2

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