Is it possible to see that a forum exists but when a user who does not have privileges clicks on it it says they are not allowed to view anything?
Set up a link forum which is visible to all.
That's how I've done it for a page which is only available to logged in users.
You can see it here: http://cliptheapex.com/community/
It's the Formula One Overtaking Statistics & Analysis link.
Then the only way is to use the View thread content permission.
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