First external login attempt redirects back to login action, second one works

Question

I\'m using OWIN\'s external authentication providers in my ASP.Net MVC 5 / WebApi 2 project and I\'ve hit a strange problem.

The login workflow is exactly like here

Answer 1

Turns out the issue was that my project initially started out as an MVC 4 application which had this in web.config causing the issue:

<authentication mode="Forms">
  <forms loginUrl="~/Account/Login" timeout="2880" />
</authentication>

I think both OWIN and Forms authentication was active at the same time.

Answer 2

As Forms Authentication was added i was being redirected to Login Page. So, removing this code helped

<authentication mode="Forms">
  <forms loginUrl="~/Account/Login" timeout="2880" />
</authentication>

but i had to add this line as well

<system.webServer>
   <validation validateIntegratedModeConfiguration="false" />
   <modules>
      <remove name="FormsAuthentication" />  <-- added this line to remove it completely --> 
   </modules>
</system.webServer>

hope this helps someone.

Answer 3

I have the same issue that occurs when i update the ASPNet.Web.Pages.Web.Data 3.1.1 nuget to any later versions. With 3.1.1 it is works! I found the solution here.