Skip to main content

What should I do when on Azure Web Role I get "HTTP Error 401.2 - Unauthorized. You are not authorized to view this page due to invalid authentication headers"

This post is dedicated to a simple but annoying issue that can appear when you are developing a ASP.NET MVC Application.
When I run my web application on my local machine, directly from Visual Studio, my web sites works perfectly. When I deploy it on a Web Role I get "HTTP Error 401.2 - Unauthorized. You are not authorized to view this page due to invalid authentication headers"
The same problem can appears if you deploy on on-premises servers, but in general this problem pop-ups on Web Roles. Not because a web role is different (it has the same layers as a web server -OS and IIS), but because people that are working with cloud solutions forget about infrastructure layers.

If we are reading the error message we can identify some possible root causes. But basically it seems that the user that is trying to access the page is not authorized.
But why it is working on the development machine from Visual Studio? Simple, in general the developer is also the admin on the machine and he access the page as an administrator and has full access.
On the local machine this can be replicated easily if you deploy the web site on your local IIS and play a little with the user that access the web site.



If you will not set this value, the value that is set in IIS will be used by default. For web roles, by default IIS is 'closed', it means that it is not open for anonymous access and you need to specify if you want to allow anonymous users to access your website.
Based on what Visual Studio template you are using to create your web site, the value could be set by default to true or not.

To allow anonymous users to access your web site you need to do the following things in the configuration file (web.config):
<system.web>
     <authorization>
          <allow users="*" />
     </authorization>
</system.web>
...
<system.webServer>
     <security>
          <authorization>
               <add accessType="Allow" users="?" />
          </authorization>
     </security>
</system.webServer>
The above configuration disables all authentication mechanisms and allows anonymous users to access your site.

For HTTP error code 401.2 on Web Roles I observed that this is the most common problem.

Comments

Popular posts from this blog

How to check in AngularJS if a service was register or not

There are cases when you need to check in a service or a controller was register in AngularJS.
For example a valid use case is when you have the same implementation running on multiple application. In this case, you may want to intercept the HTTP provider and add a custom step there. This step don’t needs to run on all the application, only in the one where the service exist and register.
A solution for this case would be to have a flag in the configuration that specify this. In the core you would have an IF that would check the value of this flag.
Another solution is to check if a specific service was register in AngularJS or not. If the service was register that you would execute your own logic.
To check if a service was register or not in AngularJS container you need to call the ‘has’ method of ‘inhector’. It will return TRUE if the service was register.
if ($injector.has('httpInterceptorService')) { $httpProvider.interceptors.push('httpInterceptorService&#…

ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded

Today blog post will be started with the following error when running DB tests on the CI machine:
threw exception: System.InvalidOperationException: The Entity Framework provider type 'System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer' registered in the application config file for the ADO.NET provider with invariant name 'System.Data.SqlClient' could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information. at System.Data.Entity.Infrastructure.DependencyResolution.ProviderServicesFactory.GetInstance(String providerTypeName, String providerInvariantName) This error happened only on the Continuous Integration machine. On the devs machines, everything has fine. The classic problem – on my machine it’s working. The CI has the following configuration:

TeamCity.NET 4.51EF 6.0.2VS2013
It seems that there …

[Post-Event] Codecamp Conference Cluj-Napoca - Nov 19, 2016

Last day I was invited to another Codecamp Conference, that took place in Cluj-Napoca. Like other Codecamp Conferences, the event was very big, with more than 1.000 participants and 70 sessions. There were 10 tracks in parallel, so it was pretty hard to decide at  what session you want to join.
It was great to join this conference and I hope that you discovered something new during the conference.
At this event I talked about Azure IoT Hub and how we can use it to connect devices from the field. I had a lot of demos using Raspberry PI 3 and Simplelink SensorTag. Most of the samples were written in C++ and Node.JS and people were impressed that even if we are using Microsoft technologies, we are not limited to C# and .NET. World and Microsoft are changing so fast. Just looking and Azure IoT Hub and new features that were launched and I'm pressed (Jobs, Methods, Device Twin).
On backend my demos covered Stream Analytics, Event Hub, Azure Object Storage and DocumentDB.

Title:
What abo…