Error message 401.2.: Unauthorized: Logon failed due to server configuration. When application deployed

Question

I have an asp.net 4.0 application that works fine running under cassini but when i deploy to IIS i get the above error. It is running under the Default App pool which a number of other apps use and work fine. Here is a copy of my web config which may be the source:

<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->

<configuration>
  <connectionStrings>
    <add name="FMLconnect" connectionString="Server=192.168.20.125;Port=;Database=FML;Uid=******;Pwd=*****;pooling=false;" providerName="MySql.Data.MySqlClient"  />
  </connectionStrings>

  <system.web>
    <httpHandlers>
      <add path="ChartImg.axd" verb="GET,HEAD,POST" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>
      <add path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" validate="false"/>
      <add path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" validate="false"/>
      <add path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" validate="false"/>
      <add path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" validate="false"/>
      <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false"/>
      <add path="Reserved.ReportViewerWebControl.axd" verb="*" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" validate="false"/>
      <add type="Telerik.ReportViewer.WebForms.HttpHandler, Telerik.ReportViewer.WebForms, Version=5.1.11.928, Culture=neutral, PublicKeyToken=a9d7983dfcc261be" path="Telerik.ReportViewer.axd" verb="*" validate="true"/>
    </httpHandlers>
    <compilation debug="true" targetFramework="4.0" >
      <assemblies>
        <add assembly="Microsoft.Build.Framework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
        <!--<add assembly="Microsoft.ReportViewer.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
        <add assembly="Microsoft.ReportViewer.WebForms, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>-->
        <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
        <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
        <add assembly="System.Management, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
        <add assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
      </assemblies>
    </compilation>




  </system.web>

  <system.webServer>
       <validation validateIntegratedModeConfiguration="false" />
    <modules runAllManagedModulesForAllRequests="true" />
  </system.webServer>
</configuration>

Answer 1

With IIS, this really just sounds like you need to check the authentication settings for your app in IIS Admin. Try this link: http://support.microsoft.com/kb/253667

This is for IIS6, you didn't mention whether you were using IIS 6 or 7. For IIS 7, try this: http://support.microsoft.com/kb/942043

Answer 2

This always happens to our project after it's reloaded.

If you're using Windows Authentication, the problem might be as simple as updating your project properties to Enable Windows Authentication.

In Visual Studio, get to your project properties (I usually right-click a file > properties to open the properties window. Then click on my project). Make sure Windows Authentication is set to Enabled

Answer 3

If you're working with IIS Express, check the web.config

        <!--  AUTHENTICATION 
      This section sets the authentication policies of the application. Possible modes are "Windows", 
      "Forms", "Passport" and "None"
-->
    <authentication mode="Windows"/>
    <identity impersonate="true"/>
    <!--  AUTHORIZATION 
      This section sets the authorization policies of the application. You can allow or deny access
      to application resources by user or role. Wildcards: "*" mean everyone, "?" means anonymous 
      (unauthenticated) users.
-->
    <!--<authorization>
        <deny users="?"/>-->
        <!-- Allow all users -->
        <!--  <allow     users="[comma separated list of users]"
                         roles="[comma separated list of roles]"/>
              <deny      users="[comma separated list of users]"
                         roles="[comma separated list of roles]"/>
        -->
    <!--</authorization>-->