Unauthorized error 401 in dynamics nav web service client

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Posted on by Community Member

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

The request failed with HTTP status 401: Unauthorized.

my code in C# is the following :

public static List<Customer_Card.Customer_Card> GetCustomersList()

{

Customer_Card.Customer_Card[] Customers = new Customer_Card.Customer_Card[]{};

try

{

Customer_Card_Service service = new Customer_Card_Service();

service.UseDefaultCredentials = true;

service.Credentials = new NetworkCredential("xxxx", "xxxx","xxxx");

service.PreAuthenticate = true;

Customer_Card.Customer_Card cust = new Customer_Card.Customer_Card();

Customer_Card_Filter CustomerFilter = new Customer_Card_Filter();

Customers = service.ReadMultiple(new Customer_Card_Filter[] { }, "", 1000);

}

catch (Exception e)

{

Msg(e.Message.ToString());

}

return Customers.ToList();

}

any help will be appreciated

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Suresh Kulla 50,243 Super User 2025 Season 2 on at

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Make sure the user that is used to running the NAV service has permission to access the dataase.

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Community Member on at

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the user is assigned with the permission : super

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keoma 32,729 on at

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do not use both lines

service.UseDefaultCredentials = true;

service.Credentials = new NetworkCredential("user", "password","domain");

either use UseDefaultCredentials OR set a specific credential.

check, if the credential data are correct and the current windows/AD user or the user defined in the networkcredential constructor has the needed rights for connecting nav (and the sql database behind).

check firewall and antivirus settings. take them offline, try again.

also check error and warning entries in windows eventlog according web service calls.

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Community Member on at

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Check following link. It might help.

blogs.msdn.com/.../connecting-to-nav-web-services-from-c-using-web-reference.aspx

Try to check the solution from NAV application server directly with Admin user and see the results.

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Alexander Ermakov 28,096 on at

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Usually this error comes when user is not authorized to access the server. What authentication type do you use?

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Community Member on at

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what do you mean by authentication type?

The user is assigned with a windows authentication user name in dynamic nav.

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Community Member on at

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tried it didn't work.

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Gaspode on at

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Hi there, did you ever get a solution to this? I'm having a similar problem in NAV 2016 where I cannot access the Web service unless the Use NTLM is ticked. If I try using the service without NTLM ticked, I always get a 401.

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Srini 100 on at

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HI, thanks for the point, Not able to get the positive result on Test Web Connection if we use the Network service into NAV service. Once the logon crediential is changed, the test web connection is complete successful. Thanks for the point posted.

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