2837206 - Cloud Connector suddenly stops working and the error "Invalid status of handshake response: 401 Unauthorized" is thrown

Symptom

Suddenly, the Cloud Connector cannot establish a connection to one of the subaccounts of SAP BTP. There have been no configuration changes or system updates.
In the ljs_trace file the following can be seen:

ERROR#com.sap.core.connectivity.tunnel.client.notification.NotificationClient#notification-client-nn-n# #Unable to handshake with notification server connectivitynotification.<region>.hana.ondemand.com/<IP address>:<port>
com.sap.core.connectivity.tunnel.core.handshake.TunnelHandshakeException: Invalid status of handshake response: 401 Unauthorized

Environment

SAP Cloud Connector

Product

SAP Connectivity service all versions

Keywords

Certificate ; validity scc s-user, com.sap.core.connectivity.tunnel.core.handshake.TunnelHandshakeException: Invalid status of handshake response: 401 Unauthorized, sap cloud platform, scp , KBA , scc , 503: service unavailable , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , Problem

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