Try writing a custom middleware and placing it as the first middleware: public class GlobalExceptionMiddleware : OwinMiddleware { public GlobalExceptionMiddleware(OwinMiddleware next) : base(next) {} public override async Task Invoke(IOwinContext context) { try { await Next.Invoke(context); } catch(Exception ex) { // your handling logic } } } Place it as the first middleware: public class Startup … Read more
I have encountered the same problem and traced the cause to OWIN ASP.NET hosting implementation. I would say it’s a bug. Some background My findings are based on these assembly versions: Microsoft.Owin, Version=2.0.2.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 Microsoft.Owin.Host.SystemWeb, Version=2.0.2.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a OWIN uses it’s own abstraction to work with response Cookies (Microsoft.Owin.ResponseCookieCollection). This … Read more