3304911 - SAP Cloud Connector Error - "An existing connection was forcibly closed by the remote host"

1. A connection error occurs between the SAP Cloud Connector and BTP, as the remote server is "connectivitynotification.cf.us20.hana.ondemand.com".
2. When using CPI, DWC, SAC, and IBP as the frontend system to connect with the backend system via the SAP Cloud Connector, the connection fails with the following error in the ljs_trace.log (<2.17)/scc_core.trc (>=2.17) files: -
   
   "2023-02-10 09:30:50,111 -0400#ERROR#com.sap.core.connectivity.tunnel.core.handlers.TunnelErrorHandler#notification-client-58-1#          #Unexpected problem during tunnel processing in channel [id: 0x747d7319, L:/xx.x.xx.xxx:xxxxx - R:connectivitynotification.cf.us20.hana.ondemand.com/40.91.120.100:443]; Reason: An existing connection was forcibly closed by the remote host."

*Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.

SAP Cloud Connector release independent.

Cloud Connector, forcibly closed, Reset by peer, An existing connection was forcibly closed by the remote host, Cloud Connector, BTP, CPI, DWC, SAC, IBP, backend system, frontend system, connectivity, tunnel processing, connectivitynotification.cf.us20.hana.ondemand.com, connection error, forcibly closed by remote host, TCP reset, TCP Reset from Client, proxy, firewall, network components, certificate exchange, Connectivity Service, SCC, connection failure, tunnel error, reset by peer, timeout, long-running connections, connection termination, KBA 2258549, SAP Cloud Connector, communication error, remote server, network trace,  , KBA , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , Problem