3276488 - HTTPS connection to Backend system is "Not Reachable" from SAP Cloud Connector with error "Peer certificate rejected by ChainVerifier"

On premise backend systems are not reachable through the Cloud Connector.
 

Error reported in ljs_trace / scc_core.trc :

====
2022-11-21 17:11:35,636 +0530#INFO#com.sap.scc.rt#com.sap.scc.servlets.AccessControlServlet$3#          #SccEndpointValidator failed to establish connection to HTTPS://<hostname>:44300
iaik.security.ssl.SSLCertificateException: Peer certificate rejected by ChainVerifier
    at iaik.security.ssl.y.a(SourceFile:932)
    at iaik.security.ssl.n.b(SourceFile:1066)
    at iaik.security.ssl.n.a(SourceFile:1503)
    at iaik.security.ssl.y.d(SourceFile:784)
    at iaik.security.ssl.SSLTransport.startHandshake(SourceFile:569)
    at iaik.security.ssl.SSLSocket.startHandshake(SourceFile:386)
    at com.sap.scc.tcs.e2e.BackendCheckHelper$TLSSecuredBackendCheckHelper.check(BackendCheckHelper.java:147)
    at com.sap.scc.tcs.e2e.HttpBackendChecker.check(HttpBackendChecker.java:58)
    at com.sap.scc.tcs.e2e.SccEndpointValidator.checkConnection(SccEndpointValidator.java:86)
    at com.sap.scc.tcs.e2e.SccEndpointValidator.checkEndpoint(SccEndpointValidator.java:72)
    at com.sap.scc.servlets.AccessControlServlet$3.run(AccessControlServlet.java:562)
    at java.lang.Thread.run(Thread.java:838)
====

Note: 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

SAP cloud Connector, SCC, Trust store, certificate, SCC configuration, not reachable, backend, root certificate, HTTP, HTTPS,Determining Trust Through Allowlist , KBA , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , Problem