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Errors such as [i]The selected forum does not exist[/i] and [i]The selected topic does not exist[/i] should send a 404 Not Found error.
If the board is disabled, all phpBB related pages should send a 503 Service Unavailable error.
If the user tries to access a forum he/she is not allowed to access (eg. incorrect password, incorrect permissions) then a 401 Unauthorized error should be sent.
If phpBB gets a E_USER_ERROR then phpBB should send a 500 Internal Server Error.