Once of our team member is unable to get response from Jenkins slave agent and looks like cloudflare is blocking the request from Jenkins slave agent. Please look into this issue ASAP.
Debug Logs & Related Link:
INFO: Trying protocol: JNLP4-connect
Aug 25, 2021 11:03:03 AM org.jenkinsci.remoting.protocol.impl.BIONetworkLayer$Reader run
INFO: Waiting for ProtocolStack to start.
Aug 25, 2021 11:03:03 AM org.jenkinsci.remoting.protocol.impl.AckFilterLayer abort
WARNING: [JNLP4-connect connection to firmware.breville.com/126.96.36.199:2096] Incorrect acknowledgement sequence, expected 0x000341434b got 0x485454502f
Aug 25, 2021 11:03:03 AM hudson.remoting.jnlp.Main$CuiListener status
INFO: Protocol JNLP4-connect encountered an unexpected exception
java.util.concurrent.ExecutionException: org.jenkinsci.remoting.protocol.impl.ConnectionRefusalException: Connection closed before acknowledgement sent