I tried to install nuget packages in my new test application and set VS for accessing nuget.telerik.com. After several attempts I was prompt for credentials. Nothing happend, then in second try it works. After that I never entered list of telerik packages with comment Error 401. I tried everything, reset credentials in window credential manager. Even changed my mail trying to reset all but nothing happen. Obviously my credential to enter my telerik account is valid as I am logged in but nuget packages are not available to me.