3.1.5.4 MTAG_PING (MsgTag 0x00000004)

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A protocol implementation SHOULD send out MTAG_PING messages periodically to verify that its session with a communication partner is active. (If the session is unavailable, sending the MTAG_PING message will return an error [MS-ERREF].) A successful MTAG_PING indicates that the RPC session with the communication partner is active. When an MTAG_PING message is received over a session, the MSDTC Connection Manager: OleTx Multiplexing Protocol (CMP) implementation MUST ignore it.