You can see multiple entries in SAP Cloud Connector logs (ljs_trace.log) such as the below:
<YYYY/MM/DD> <Timestamp> #DEBUG#com.sap.core.connectivity.spi.processing.OutboundConnectionErrorHandler#tunnel-client-64-1#<ID>#Backend channel [id: <ConnectionID>, L:/<LocalHost> ! R:<RemoteHost>/<IP_Address>] is closed
<YYYY/MM/DD> <Timestamp> #ERROR#com.sap.core.connectivity.spi.processing.AbstractProtocolProcessor#tunnel-client-64-2#<ID>#Discarding packet as connection to backend has been unexpectedly closed
SAP Cloud Connector
SCC, SAP Cloud Connector, #Discarding packet as connection to backend has been unexpectedly closed, ftp server, backend, network, firewall, backend channel is closed, ljs_trace.log , KBA , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , Problem
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