You can just select an authentication profile, that you will have created for RADIUS. This will allow Captive Portal to work with RADIUS and not NTLM - you need not select the User ID Agent in this case (you can leave it blank).
it should be of note that older browsers you could do this (redirect with a self signed) and there was no issue.
example if you take firefox 3 and try this it works with no errors.
however newer browsers wont allow a self signed certificate they will show errors, this is something that the browser manuifacture's have chosen to do to prevent macicious behavior. to "undo this feature" you would have to contact your browser manuifacture or google around for a way to defete this "protection" should you want to use a self signed cert....
ideally your not using a self signed certificate for this behavior as your complications go beyond firefox and IE ...aka BlackBerry Chrome Safari etc all of which will be enabling protection like this..
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