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The error response message MUST be validated in the same way as Simple Traversal of UDP through NAT (STUN) binding response messages. The validation procedure is specified in section 3.1.5.2.2.1.
If the transport address for which the error response is received is already in the "Recv-Valid" or "Valid" state for User Datagram Protocol (UDP) or in the "Valid" state for Transmission Control Protocol (TCP), the error response message MUST be discarded. If the error code in the error response message is 401, 430, 431, 432, or 500, connectivity checks for the transport address SHOULD be retried. If any other error code is received in the binding error response message, the transport address pair MUST be set to the "Invalid" state.