troubleshooting-centos-7-jenkins-iptables.txt

Error messages:
$ tailf /var/log/jenkins/jenkins.log

WARNING: Prober(fe80:0:0:0:c2b:e0ff:feff:d000%eth1.local.).run() exception
java.io.IOException: Operation not permitted (sendto failed)
        at java.net.PlainDatagramSocketImpl.send(Native Method)
        at java.net.DatagramSocket.send(DatagramSocket.java:693)
        at javax.jmdns.impl.JmDNSImpl.send(JmDNSImpl.java:1537)
        at javax.jmdns.impl.tasks.state.DNSStateTask.run(DNSStateTask.java:131)
        at java.util.TimerThread.mainLoop(Timer.java:555)
        at java.util.TimerThread.run(Timer.java:505)

Dec 24, 2017 10:02:41 AM javax.jmdns.impl.JmDNSImpl __recover
WARNING: RECOVERING
Dec 24, 2017 10:02:41 AM javax.jmdns.impl.tasks.state.DNSStateTask run
WARNING: Canceler(fe80:0:0:0:c2b:e0ff:feff:d000%eth1.local.).run() exception
java.io.IOException: Operation not permitted (sendto failed)
        at java.net.PlainDatagramSocketImpl.send(Native Method)
        at java.net.DatagramSocket.send(DatagramSocket.java:693)
        at javax.jmdns.impl.JmDNSImpl.send(JmDNSImpl.java:1537)
        at javax.jmdns.impl.tasks.state.DNSStateTask.run(DNSStateTask.java:131)
        at java.util.TimerThread.mainLoop(Timer.java:555)
        at java.util.TimerThread.run(Timer.java:505)

Dec 24, 2017 10:02:46 AM javax.jmdns.impl.DNSStatefulObject$DefaultImplementation waitForAnnounced
WARNING: Wait for announced cancelled: DNS: fe80:0:0:0:c2b:e0ff:feff:d000%eth1.local. state: canceling 1 task: null
Dec 24, 2017 10:02:46 AM javax.jmdns.impl.DNSStatefulObject$DefaultImplementation waitForCanceled

Workaround:
-- added to iptables script:
...
-A INPUT -i eth1 -s 224.0.0.0/4 -j ACCEPT
-A OUTPUT -o eth1 -d 224.0.0.0/4 -j ACCEPT
...