dynamics nav webservice error 401 Unauthorized

Question

When consuming a dynamics nav web service I get the following error :

The request failed with HTTP status 401: Unauthorized.

However when I try it in a browser it works . I tried the following but its still not working :

service.UseDefaultCredentials = true;
service.PreAuthenticate = true;

also :

service.Credentials = new System.Net.NetworkCredential("XXXXX", "XXXX","XXXX");

I even tried using dynamics nav acces key but also it didn't work.

Any new suggestions ?

Answer 1

I know this thread is more than 4 years old, but i thought if somone is currently searching for this problem he will come across this trhead, like me.

There is currently a problem with NTLM and Xamarin (at the moment i write this, the problem also exists in .net core on MacOS).

See the links:

iOS: https://github.com/xamarin/xamarin-macios/issues/7770

Android: https://developercommunity.visualstudio.com/content/problem/756697/last-visual-studio-update-brakes-ntlm-authenticati.html

The solution is to use the "MonoWebRequestHandler". For a combined Android and iOS Solution check my latest post here

I hope i could save somones time with this post!

Answer 2

Several things might be wrong.

Did you check what kind of authentication the Service Tier is setup to? Is there a default company set (or are you selecting a company in the URL). Is NTLM on or off; these are all possible reasons this error might popup.

Answer 3

I think you're code should be like that

service.UseDefaultCredentials = false;
service.Credentials = new System.Net.NetworkCredential("XXXXX", "XXXX","XXXX");

You must enabled NTLM setting properties authentification if you are using PHP or Java Or XAMARIN Use NTLM Authentication

Answer 4

This piece of code below is working for me (I wasn't really adjusting the Service Tier - it has more or less the default settings):

service.ClientCredentials.Windows.ClientCredential.Domain = <domain>;
service.ClientCredentials.Windows.ClientCredential.UserName = <username>;
service.ClientCredentials.Windows.ClientCredential.Password = <password>;
service.ClientCredentials.Windows.AllowedImpersonationLevel = 
  System.Security.Principal.TokenImpersonationLevel.Delegation;

If that above doesn't work try to get rid of the domain from the NetworkCredential - just use your username and password (if the client and the server are in the same domain, obviously).