Hi,

first of all I hope I ended up in the right list, if not, I’m happy to restate 
the question in the appropriate one!

My question is regarding the OpenID Connect Back- and Front-Channel logout 
(1.0) draft 4 / draft 2. We are currently executing these for all RPs, 
regardless of the specific device / session of the user. Example: Assuming the 
user has two distinct, active sessions on two separate end devices, RPs would 
be notified regardless of the device that was used to perform the OIDC flow in 
the first place, and that is now used by the user to requesting the logout.

However, one of our community members asked if that is correct, as he would 
expect only those RPs to receive the logout request that have their ID Token 
associated with the specific device session, not globally.

The spec doesn’t - as far as I can tell - give a clear answer to that. Seeing 
that RPs may support the `sid` parameter, it could mean that this is up to the 
RP to decide, not the OP.

It would be great to get clarification on this topic, and maybe provide 
concrete guidelines in the official spec!

I am writing on behalf of the open source, OpenID Certified OpenID Connect 
Provider ORY Hydra ( https://github.com/ory/hydra 
<https://github.com/ory/hydra> ).

Thank you for your time,
Aeneas
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