The request failed with HTTP status 401: Unauthorized

Question

I have a .NET 2.0 website (VB) running in my IIS6 (XP Pro SP2) and a .NET 3.5 (configured as .NET2 under IIS's ASP.NET tab, of course) hosting an ASMX web service.

In Chrome, I can call the ASMX and invoke the web methods successfully. However, in calling the web methods in code, from the .NET 2.0 website I get:

The request failed with HTTP status 401: Unauthorized.

How do I get around this?

score 22 · Accepted Answer · edited Apr 13 '11 at 14:44

22

You need to set the credentials in you application when you initialise the webService object.

Something like webService.UseDefaultCredentials = true

This will set the credentials of the request to the current user executing the application.

edited Apr 13 '11 at 14:44

youwhut

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answered Jul 19 '10 at 16:14

btlog

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This is for the cient created in VB/C# .. what about Java, say I need to connect to this webservice through mobile application. In that case, I can't get the Default credentials. – rDroid Aug 28 '13 at 10:30
you saved lot of time. Thank you. – DelphiLearner Apr 04 '16 at 15:13
Oh my God. We've had code in our ASP.Net site without this "UseDefaultCredentials" setting for years, and it's always worked fine. Yesterday, a Microsoft security patch was applied suddenly we got a "401 Unauthorized" error each time. Adding this one line of code fixed the problem... really strange. – Mike Gledhill Mar 23 '17 at 09:47
This will probably work when developing the application. However, be careful when deploying it as you may not have the authentication being made in the deployment machine, in which case you'll need to set them as mentioned in [Mohamad Chami's answer](https://stackoverflow.com/a/38615047/214639). – Narcís Calvet Nov 16 '17 at 10:04

score 4 · Answer 2 · answered Jul 27 '16 at 13:56

4

you can use this:

webservice.UseDefaultCredentials = true;

if does not work, use the below code instead of the code above

webservice.Credentials = new NetworkCredential("userName", "password", "domain");
webservice.PreAuthenticate = true;

note: the username Password and domain is the user credential of the user that access to webservice

so make sure that user have permission to access to web service

maybe the user is the windows user

and you can get the domain from: right click in "MyComputer" and properties the domain is the Computer name or Workgroup

answered Jul 27 '16 at 13:56

Mohamad Chami

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I am also facing the same issue – Prashant Pimpale Jan 24 '19 at 13:36
I had the same issue and your solution worked for me thank you! – lemmy njaria Nov 24 '19 at 08:44

score 3 · Answer 3 · answered Oct 01 '12 at 20:59

3

In IIS 7, enable anonymous authentication and you should be able to debug.

answered Oct 01 '12 at 20:59

Glade Mellor

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score 3 · Answer 4 · edited Jun 04 '13 at 22:05

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webService.UseDefaultCredentials = true

This worked for me.

edited Jun 04 '13 at 22:05

Dragan Okanovic

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answered Jun 04 '13 at 21:44

SinghJi

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score 0 · Answer 5 · edited Jun 29 '14 at 04:28

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im am test this way:

CheckListService.CheckList chkSrvice = new CheckListService.CheckList() {
    UseDefaultCredentials = true };

edited Jun 29 '14 at 04:28

khagler

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answered Jun 29 '14 at 04:08

ali

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The request failed with HTTP status 401: Unauthorized

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