# Does "Single sign on" feature apply to apps across different environment?

Hi all,

As mention above. Does "Single sign on" feature apply to apps across different environment?

Thank you.

Regards,

Huy,

Hello Huy,

No.
Default Single Sign-on feature of the platform works only per environment. In fact, it is a little more restricted than that, as this is achieved by cookies/session (in web applications) and so, it works in the same browser only.

If you open the same application in two different browsers, you will need to sign-in on both. After that, any other application of the SAME environment (and browser) you try to use, you will be already signed in.

To achieve cross environments SSO you need to use a Federated SSO service.

https://www.outsystems.com/learn/lesson/1885/federated-single-sign-on-authentication-in-outsystems/?LearningPathId=0

Cheers.