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Issue with device going offline


We have an issue with a 3 devices connected to the same server going offline each night at around 9 pm. 2 out of 3 devices one night stayed online all night today all went offline during the night have ran a Wireshark overnight to see what could be causing this but not 100% sure when looking at the logs. From what I can see it sends through a [SYN] from device to the server then server sends back a [SYN, ACK] then the device response with a [ACK] then it sends a heartbeat through to the server to show it's still online and then server responds with HTTP/1.1 200 OK but then straight after the device responds back with a [RST] in a red line. This seems to be the only errors I can see when filtering against the devices IP