Ssl - How To Preserve Authentication For Forms Authentication Cookie

Aug 19, 2010

We have a non-SSL ASP.NET web app that allows a user to login (ASP forms authentication, inproc).

Once authenticated, we redirect their browser to an external, SSL secured page on another web site / domain altogether that we do not control.

The client is redirected back to a pre-configured url on our original http web app when done.

However, the customer is then asked to "re-login" again on our side which is undesired...

It seems the forms authentication cookie is destroyed when transitioning between HTTP and HTTPS and back again.

How can I keep the forms authentication cookie alive so that the customer does not have to re-authenticate on the round trip?

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