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1. After analysis the logs of MCU from SMC2.0, we found that all the issue happened after MCU auto daily restart.
2. When the issue happened, we use WEB of MCU to capture the network packets
we use Filter:tcp.port==5000, it was used to check all the signal will request 5000 ports.
at line 28 : SMC2.0 will send TCP requst to MCU, that was normally request. but MCU never answer ACK to SMC2.0.
at line 30 and 31: MCU have already connected with another devices, they are sending and receiving heart beat packets.
3. After we check the IP of the third devices, that was another SMC2.0 in customer's network enviroment .
that SMC2.0 also connected with MCU for register.
Stopped the service of the other SMC2.0.