3660577 - Failed to resolve 'connectivitynotification.cf.ap10.hana.ondemand.com' perceived from SCC trace

SAP Cloud Connector subaccount is failing/not connecting to BTP, and following is perceived from SCC trace (ljs_trace.log  / scc_core.trc).

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20xx-xx-xx xx:xx:xx,xxx +0530#DEBUG#com.sap.core.connectivity.tunnel.client.reconnect.ReconnectScheduler#reconnector-66-1#          #Connecting to  connectivitynotification.cf.ap10.hana.ondemand.com/3.105.214.80:443
20xx-xx-xx xx:xx:xx,xxx +0530#DEBUG#com.sap.core.connectivity.tunnel.client.AbstractClient#reconnector-66-1#          #Connecting to address connectivitynotification.cf.ap10.hana.ondemand.com:443. No proxy is used.
20xx-xx-xx xx:xx:xx,xxx +0530#DEBUG#io.netty.resolver.dns.DnsQueryContext#notification-client-29-1#          #[id: 0x8c1f3298, L:/0:0:0:0:0:0:0:0:64116] WRITE: UDP, [4430: /xxxx:xxxx:xxxx:0:0:0:0:8888:53], DefaultDnsQuestion(connectivitynotification.cf.ap10.hana.ondemand.com. IN A)
20xx-xx-xx xx:xx:xx,xxx +0530#DEBUG#com.sap.core.connectivity.tunnel.client.AbstractClient#notification-client-29-1#          #Handshake failed! Closing channel [id: 0x4f340c90] immediately.
java.net.UnknownHostException: Failed to resolve 'connectivitynotification.cf.ap10.hana.ondemand.com' [A(1)] after 2 queries 
    at io.netty.resolver.dns.DnsResolveContext.finishResolve(DnsResolveContext.java:1150)

Caused by: io.netty.resolver.dns.DnsNameResolverException: [15452: /xxxx:xxxx:xxxx:0:0:0:0:8844:53] DefaultDnsQuestion(connectivitynotification.cf.ap10.hana.ondemand.com. IN A) failed to send a query '15452' via UDP (no stack trace available)
Caused by: java.net.SocketException: error 101 - Network is unreachable
    at sun.nio.ch.DatagramChannelImpl.send0(Native Method)
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• SAP Cloud Connector(SCC) release independent;
• SAP Business Technology Platform(BTP);
• Domain Name System(DNS).

2452568 - Log and Trace files for SAP Cloud Connector 3201518 - SAP Cloud Connector Documentation  2701137 - SAP Cloud Connector - Guided Answers 3651086 - Which hosts/IP addresses to allow when adding a new subaccount to SAP Cloud Connector , KBA , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , Problem