When you try to access the Microsoft Dynamics NAV Web client, you get an error that is similar to the following:
Server Error in '/' Application.
Access is denied.
Description: An error occurred while accessing the resources required to serve this request. The server may not be configured for access to the requested URL.
Error message 401.2.: Unauthorized: Logon failed due to server configuration.
Resolution
This error can occur when the authentication method that is configured in the web.config file for the Microsoft Dynamics NAV Web client is not enabled in Internet Information Services (IIS). The Microsoft Dynamics NAV Web client can be configured to use either Windows authentication or forms authentication. By default, the Microsoft Dynamics NAV Web client uses Windows authentication.
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When you use Windows authentication, the Windows authentication feature must be turned on in IIS and enabled on the website for the Microsoft Dynamics NAV Web client.
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When you use forms authentication, both forms authentication and anonymous authentication must be enabled on the website for Microsoft Dynamics NAV Web client.
 Note |
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| For more information about authentication with the Microsoft Dynamics NAV Web client, see How to: Configure Authentication of Microsoft Dynamics NAV Web Client Users. |
To turn on the Windows Authentication feature in IIS
Use Internet Information Services (IIS) Manager to turn on Windows authentication on IIS. For more information, see How to: Install and Configure Internet Information Services for Microsoft Dynamics NAV Web Client
To enable an authentication method on the Microsoft Dynamics NAV Web client website
On the computer that is running Microsoft Dynamics NAV Web Server components, to open Internet Information Services (IIS) Manager and do one of the following:
In Windows 7, on the Start menu, in the Search Programs and Files box, type inetmgr, and then press Enter.
In Windows Server 2008 R2, on the Start menu, choose All Programs, choose Administrative Tools, and then choose Internet Information Service (IIS) Manager.
In the Connections pane, under Sites, choose Microsoft Dynamics NAV 2016 Web Client.
Under IIS, double-click Authentication.
To enable an authentication method, in the Authentication pane, choose the authentication, and then choose Enable in the Actions pane.
Restart the web server.
To restart IIS
In the Connections pane of Internet Information Services (IIS) Manager, choose the root node for your computer, and then in the Actions pane, choose Restart.