3621985 - "No tunnel channels available" error occurs in SCC traces - SAP Connectivity Service

The following log entries and error message appear (the sequence of the log entries matters) in the traces of the Cloud Connector that connects the BTP application to the on-premise ECC system:

<timestamp> +0200#TRACE#com.sap.core.connectivity.tunnel.core.handlers.MessagePacketHandler#tunnel-client-<id>#Received message of type 2 (close connection) over tunnel channel [<tunnel details>]; tunnelId: account:///<tunnel details>
<timestamp> +0200#DEBUG#com.sap.core.connectivity.tunnel.core.Tunnel#tunnel-client-<id>#Unsubscribed connectionId <id> from tunnelId account:///<tunnel details>
...
<timestamp> +0200#TRACE#com.sap.core.connectivity.spi.processing.DefaultBusinessChannelStatisticsHandler#tunnel-client-<id>#Report close connection with Connection statistics - connectionId: <id>, protocol: HTTP, host:<host>, port: <port>, tunnelId: account:///<tunnel details>, <data exchange details>
<timestamp> +0200#DEBUG#com.sap.core.connectivity.spi.processing.OutboundConnectionErrorHandler#tunnel-client-<id>#Backend channel [<backend address>] is closed
<timestamp> +0200#DEBUG#com.sap.core.connectivity.tunnel.core.Tunnel#tunnel-client-<id># #Discarding package as there is no subscribed channel for connectionId <id> and tunnelId account:///<tunnel details>
<timestamp> +0200#ERROR#com.sap.core.connectivity.spi.processing.OutboundConnectionErrorHandler#tunnel-client-<id>#Exception caught while closing an outbound channel [<tunnel details>] com.sap.core.connectivity.spi.NoChannelsAvailableException: No tunnel channels available

• SAP Cloud Connector
• SAP Business Technology Platform

BC-MID-SCC, SCC, Cloud Connector, traces, channel , KBA , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , Problem