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

Symptom

In all of the sudden, your Cloud Connector(SCC) cannot establish a connection to one of the subaccounts of SAP BTP cloud environment, even though there have been no configuration changes or system updates.

From either scc_core.trc (SCC version >=2.17) or the ljs_trace.log (SCC version <2.17) the following is perceived:

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

Note: Image/data in this KBA is from SAP internal systems, sample data, or demo systems, and any resemblance to real data is purely coincidental.

Environment

SAP Cloud Connector release independent;
SAP BTP Neo environment;
SAP BTP Cloud Foundry environment.

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, BTP, sub-account, sub account, subaccount, SAP Cloud connector, Neo, Cloud Foundry, CF, SSL, certificate, 400, 503, proxy, proxy not reached, region host, red status, 2.17.0, 2.17.1, 2.16.2, 2.15.2, 401, 402, 406, 403, ondemand.com, hana.ondemand.com, eu, cf, ap1, forbidden, invalid, certificate, expired , KBA , scc , 503: service unavailable , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , Problem

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