The error 503 Service Unavailable
occurs when a new request tries to access a session where more than 16 requests are pending on that session, or an error
occurred while queuing the session.
The error 403 Forbidden
occurs if the client IP address or hostname does not match that of the creator of the session.
A request stipulating a session that does not exist does not implicitly generate an error. It is up to the web application to detect this condition (by checking SessionID, SessionCreateTime, or SessionLastTime connection properties) and do the appropriate action.
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