SSO between different websites

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Is it possible to achieve a single sign-on between 2 different websites
having 2 different domain names & hosted on 2 different hosts?

I.e. you login to site1. Then click on on a link on site1 which takes you to
site2 & logs you in automatically to site2.

Assuming you have control of both websites, how can this be done?

Re: SSO between different websites

KJ wrote:

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You multi-posted to alt.php where you already have an answer.

Please don't multi-post; cross-post only if absolutely necessary.

   -Four wheels carry the body; two wheels move the soul

Re: SSO between different websites

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Off the top of my head?  You could use one machine as a "signon
server" which holds user account details, is responsible for issuing
cookies and so on, and then have each client website communicate with
it via CURL.

Probably not the best solution, but like I said it was just off the
top of my head.  But in answer to your question?  In theory yes it is

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