Server cannot set status after HTTP headers have been sent IIS7.5

Question

Sometimes I get exception in my production environment:

• Process information
  • Process ID: 3832
  • Pr

Answer 1

I had the same issue with setting StatusCode and then Response.End in HandleUnauthorizedRequest method of AuthorizeAttribute

var ctx = filterContext.HttpContext;
ctx.Response.StatusCode = (int)HttpStatusCode.Forbidden;
ctx.Response.End();

If you are using .NET 4.5+, add this line before Response.StatusCode

filterContext.HttpContext.Response.SuppressFormsAuthenticationRedirect = true;

If you are using .NET 4.0, try SuppressFormsAuthenticationRedirectModule.