forms authentication returns 401 instead of going to login page

From: Andy Fish (ajfish_at_blueyonder.co.uk)
Date: 02/24/05 

Date: Thu, 24 Feb 2005 15:15:34 -0000

Hi,

I have an app in the 1.1 framework that uses forms authentication .

In the normal case, if the user requests a page and is not logged in, he is
redirected to the login page. However, I have noticed that if the original
request includes a parameter called "ReturnUrl", the server immediately
responds with a 401 error.

I realise that ReturnUrl is also the name of a parameter used by forms
authentication, but I don't see why this should cause any conflict, so it
seems this is simply a bug in the framework. I can't find any documentation
to say that ReturnUrl is a reserved name and cannot be used as an HTTP
request parameter.

Does anyone know of a workaround for this (apart from not having the
parameter called ReturnUrl)? are there any other parameter names I should
avoid?

TIA

Andy

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