3780417 - Connection timed out connecting SAP Cloud Connector with backend system

Upon setting up a new SCC mapping/connection with a backend system, following is raised from SCC trace scc_core.trc.

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20xx-xx-xx xx:xx:xx,xxx +0000#INFO#com.sap.scc.rt#AccessControl connection checker#          #SccEndpointValidator failed to establish connection to HTTPS://XX.XX.XX.XX:443
java.net.SocketTimeoutException: connect timed out (local port 54138 to address YY.YYY.YYY.YY (host.domain.com), remote port 443 to address XX.XX.XX.XX (host.domain.com))
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:476)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:218)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:200)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:394)
    at java.net.Socket.connect(Socket.java:874)
    at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:303)
    at com.sap.scc.tcs.e2e.BackendCheckHelper$TLSSecuredBackendCheckHelper.check(BackendCheckHelper.java:135)
    at com.sap.scc.tcs.e2e.HttpBackendChecker.check(HttpBackendChecker.java:60)
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• SAP Cloud Connector release independent;
• Backend system release independent.

sap cloud connector, connector, CC, SAP CC, time out, backend, back end, communication, proxy, mapping, SCC mapping, HTTP, HTTPS, AccessControl connection checker, SocketTimeoutException , KBA , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , Problem