3723892 - Connection timed out after 30000 ms raised while connecting subaccount from SAP Cloud Connector

In all of the sudden a BTP subaccount stops operating from SCC, and following time out is perceived from SCC trace (ljs_trace.log / scc_core.trc)


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20xx-xx-xx xx:xx:xx,xxx +0000#ERROR#com.sap.scc.rt#https-jsse-nio2-8443-exec-10# #Tunnel account:///<subaccount-ID> connect failed
io.netty.channel.ConnectTimeoutException: connection timed out after 30000 ms: connectivitynotification.cf.us10.hana.ondemand.com/52.4.101.240:443
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:263)
at io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98)
at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:160)
...
.....
.......
20xx-xx-xx xx:xx:xx,xxx +0000#ERROR#com.sap.core.connectivity.tunnel.client.reconnect.AbstractReconnectableClient#notification-client-9-1# #Connect client to 'connectivitynotification.cf.us10.hana.ondemand.com/52.23.189.23:443' failed: connection timed out after 30000 ms: connectivitynotification.cf.us10.hana.ondemand.com/52.4.101.240:443
20xx-xx-xx xx:xx:xx,xxx +0000#WARN#com.sap.scc.config#com.sap.scc.config.AccountConfiguration$/0x00000001004d5c40# #service channels of account <subaccount-ID>@cf.us10.hana.ondemand.com not restored due to failed tunnel connection
20xx-xx-xx xx:xx:xx,xxx +0000#ERROR#com.sap.scc.rt#https-jsse-nio2-8443-exec-7# #Tunnel account:///<subaccount-ID> connect failed
io.netty.channel.ConnectTimeoutException: connection timed out after 30000 ms: connectivitynotification.cf.us10.hana.ondemand.com/52.4.101.240:443
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• SAP Cloud Connector(SCC) release independent;
• SAP Business Technology Platform(BTP).

sap cloud connector, CC, SCC, cloud connector, connector, tunnel, subaccount, sub-account, timeout, time out, timed out, hana.ondemand.com, reconnect, connectivitynotification, after 3000, 30000 ms, milisseconds, channel.ConnectTimeoutException, restored , KBA , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , BC-CP-CON-CF , Cloud Foundry to On-premise Connectivity service , Problem