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Asked: 2026-05-11T21:55:39+00:00

Having an issue with ASP.NET, when trying to set a cookie on subdomain1.mydomain.com to

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Having an issue with ASP.NET, when trying to set a cookie on subdomain1.mydomain.com to be read by subdomain2.mydomain.com.

“subdomain1” is an ASP.NET application running on IIS 6.
“subdomain2” is an ASP Classic application running on IIS6.

What I don’t understand is that when I test my .NET page (below) in Firefox, it works. If I test it under IE8, no cookie seems to get stored/passed to subdomain2. I’ve tried many variations on the code below, to no avail (including adding an expiry date/time):

Dim k As Guid = Guid.NewGuid
Dim c As New HttpCookie("Interstitial")

With c
.Values("a") = 1
.Values("b") = 2
.Values("c") = 3
.Values("d") = 4
.Domain = ".mydomain.com"
End With

Response.AppendCookie(c) 'Have also used Response.Cookies.Add(c)

Dim url As String = String.Format("https://subdomain2.mydomain.com/?d={0}", k.ToString)

Response.Redirect(url)

Other information that may be relevant:

  • The code above is executed in response to a postback (button click)
  • Under IE8, the response.redirect() seems to cause the browser request to never finish

Any tips/ideas would be greatly appreciated.

Thanks

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1 Answer

  1. Editorial Team

    Have you tried running the page through Fiddler? This is a brilliant tool as it shows all the HTTP activity for a request.

    I’ve previously has problems where there are strange browser issues which end up being quite esoteric like network config. Fiddler is great at lifting the lid on such problems.

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