System.Net.WebClient doesn't work with Windows Authentication
- by Peter Hahndorf
I am trying to use System.Net.WebClient in a WinForms application to upload a file to an IIS6 server which has Windows Authentication as
it only 'Authentication' method.
WebClient myWebClient = new WebClient();
myWebClient.Credentials = new System.Net.NetworkCredential(@"boxname\peter", "mypassword");
byte[] responseArray = myWebClient.UploadFile("http://localhost/upload.aspx", fileName);
I get a 'The remote server returned an error: (401) Unauthorized', actually it is a 401.2
Both client and IIS are on the same Windows Server 2003 Dev machine.
When I try to open the page in Firefox and enter the same correct credentials as in the code, the page comes up.
However when using IE8, I get the same 401.2 error.
Tried Chrome and Opera and they both work.
I have 'Enable Integrated Windows Authentication' enabled in the IE Internet options.
The Security Event Log has a Failure Audit:
Logon Failure:
Reason: An error occurred during logon
User Name: peter
Domain: boxname
Logon Type: 3
Logon Process: ÈùÄ
Authentication Package: NTLM
Workstation Name: boxname
Status code: 0xC000006D
Substatus code: 0x0
Caller User Name: -
Caller Domain: -
Caller Logon ID: -
Caller Process ID: -
Transited Services: -
Source Network Address: 127.0.0.1
Source Port: 1476
I used Process Monitor and Fiddler to investigate but to no avail.
Why would this work for 3rd party browsers but not with IE or System.Net.WebClient?
