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If a client system attempts to log on to the designated backup gateway, while the designated primary gateway is available, CME Globex will send a Logout (tag 35-MsgType=5) message, with tag 789-NextExpectedMsgSeqNum reflecting the value of the next expected sequence number for the designated primary Drop Copy session and tag 58-Text=Backup session not allowed. Logout forced.

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Info
Upon logging onto the newly promoted primary Drop Copy gateway, the client system can send a Resend Request (tag 35-MsgType=2) message to recover any missed messages. Any missed messages replayed by Drop Copy will have tag 43-PossDup=Y.

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