OwinStartup not Starting ... Why?

Question

I have the following class on an ASP.NET MVC 5 site:

[assembly: OwinStartup(typeof(MVCSite.Startup))]
namespace MVCSite {

  public partial class Startup {

    public void Configuration(IAppBuilder application) {

      application.UseCookieAuthentication(new CookieAuthenticationOptions {
        AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
        LoginPath = new PathString("/Account/Login")
      });

      application.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);
    }
  }
}

And on Web.Config I have the following:

<add key="owin:AutomaticAppStartup" value="false"/>

I have a breakpoint inside Startup.Configuration but this does not fire ...

Any idea why?

`` Presumably you want `AutomaticAppStartup` to be `true` ? Note that [these instructions](http://www.asp.net/aspnet/overview/owin-and-katana/owin-startup-class-detection) are not step-by-step. The first list shows you different options. — ta.speot.is, Nov 04 '13 at 02:02
1) As mentioned by @ta.speot.is you may want to give a true value to the owin:AutomaticAppStartup appSetting. 2) Do you have Microsoft.Owin.Host.SystemWeb nuget package installed in your project? This package is required for the Startup class to be picked up. You can check out this tutorial for more information : http://www.asp.net/aspnet/overview/owin-and-katana/owin-startup-class-detection — Praburaj, Nov 04 '13 at 02:21
Thank you. That was the problem ... I miss interpret the information on owin. — Miguel Moura, Nov 04 '13 at 10:41
Possible duplicate of [OwinStartup not firing](http://stackoverflow.com/questions/20203982/owinstartup-not-firing) — John, Sep 08 '16 at 08:41

akokani · Answer 1 · 2017-09-04T13:24:53.790

31

It's usually happend because SystemWeb package is not installed on your project.

Use this command at your Package Manager Console:

Install-Package Microsoft.Owin.Host.SystemWeb

In the other hand you may use this configuration on your app.config or web.config if the above solution is not work:

<appSettings>
    <add key="owin:AutomaticAppStartup" value="true"/>
</appSettings>

edited Sep 04 '17 at 13:24

answered Feb 20 '15 at 19:04

akokani

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7
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1

This has saved me from hours of struggle. Thanks so much. – gee'K'iran Nov 08 '17 at 20:20

score 15 · Answer 2 · answered Nov 05 '13 at 10:11

15

Using

<add key="owin:AutomaticAppStartup" value="true"/>

Is the answer.

answered Nov 05 '13 at 10:11

Miguel Moura

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I was having the same issue as the OP. I had my `Startup` class, as well as the OWIN attributes on it. I had also installed the `Owin.Host.SystemWeb` package. I didn't look at the web.config for this attribute, because I had never set it to fault. I assumed the package installation would set things up for me - I was wrong. Make sure you check for this configuration setting! – Origin Mar 21 '15 at 13:15
1

Where is it supposed to be in the config file? – Konrad Viltersten Aug 02 '16 at 20:22
@KonradViltersten: it is supposed to be in `` block – v.karbovnichy Sep 19 '16 at 18:28

score 0 · Answer 3 · edited May 12 '15 at 08:41

0

Try removing [assembly: OwinStartup(typeof(MVCSite.Startup))] and give a shot

edited May 12 '15 at 08:41

Dave New

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answered Mar 27 '15 at 20:10

Revanth Siddoju

1

The question has been answered by way of comments which the author has agreed to. – Praveen Paulose Mar 27 '15 at 20:33

OwinStartup not Starting ... Why?

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