Session expired when redirecting to a full path.

[Guest]

So I have three ASPX files. File1.aspx has in the Page.Load handler:

Response.Redirect("http://www.domain.com/directory/file3.aspx")

File2.aspx has:

Response.Redirect("/directory/file3.aspx")

File3.aspx is just a blank page.

Then, in the Global.asax file, I have code in the Session.Onstart with a
breakpoint.

When I fire up the application in debug mode on File1.aspx, the
Session.Onstart gets fired TWICE. From File2.aspx, it gets fired only once.

Is this by design? If so, what changed? ASP 3.0 doesn't have this
limitation!

Thanks.

S