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Is it possible to authenticate users across sub-domains when the authentication takes place at a sub-domain instead of the parent domain?
For example:
User logs into site1.parent.com, and then we need to send them to reporting.parent.com.
Can I authenticate them to the reporting site even though the log-in occured at a sub-domain?
So far all of the research I have done has users logging into the parent domain first and then each sub-domain has access to the authentication cookie.
You can set the cookie to be the parent domain at authentication time but you have to explicitly set it, it will default to the full domain that you are on.
Once the auth cookie is correctly set to the parent domain, then all sub-domains should be able to read it.