So, today I would like to share short bugfix I’ve recently dealt with. I deployed core application into IIS on my dev machine, because I wanted to do some tests localy, but when I opened my website in browser all I’ve got was this message:


Obiously I’m using Windows auth in my website, but something was not right. Thankfully I’ve seen this in a past so I knew this is most likely caused by disabled Windows Auth in IIS.


First we need to open IIS Manger, select our website and doubleclick Authentication item.


Next, we need to right click on Windows Authentication and select Enable. But wait, what if there is no Windows Authentication item?! Just Anonymous Authentication.


Ok, weird, but fortunately we have google right? Solution to missing Windows Authentication in IIS Manager is fairly simple. Let’s open Windows Programs and Features, fastest way is to press +R, type in: appwiz.cpl and hit Enter. From there click Turn Windows features on or off, another window will pop up. Now we go trough items: Internet Information Service World Wide Web Services Security and we need to check Windows Authentication.


Allright, click OK. Then open IIS Manager again, go to Authentication section and Windows Authentication should appear. If there is again only Anonymous Authentication for some reason, try to restart IIS Manager as administrator.


After all these steps, website should load correctly, ofcourse if there are no bugs 🙂

Solution for IIS Express

If you encounter same error while running the Asp.Net Core app from Visual Studio/Rider, do following:

  • Open Properties/launchSettings.json
  • Look for windowsAuthentication property and set it to false

Last modified: November 16, 2023
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