I'm trying kubernetes guestbook example following https://github.com/GoogleCloudPlatform/kubernetes/blob/master/examples/guestbook/README.md

In Step Six: I modified the json file to allow accessing the guestbook site externally. The modification is: replace 10.11.22.33 with my IP, and remove line ""createExternalLoadBalancer": true"

When I try http://<my ip>:8000 in browser, the connection failed. With some searching an debugging, I find kube-proxy failed to install iptables rule, there are error logs as below. The log also tells that install iptable rule also failed for other service.

Any suggestion?

Mar 19 06:23:28 centos-minion kube-proxy[629]: E0319 06:23:28.543645     629 proxier.go:563] Failed to install iptables KUBE-PORTALS-HOST rule for service "frontend"
Mar 19 06:23:28 centos-minion kube-proxy[629]: E0319 06:23:28.543685     629 proxier.go:377] Failed to ensure portal for "frontend": error checking rule: exit status 2: iptables v1.4.21: Port `:f816:3eff:fedf:8037]:51072' not valid
Mar 19 06:23:28 centos-minion kube-proxy[629]: Try `iptables -h' or 'iptables --help' for more information.
Mar 19 06:23:28 centos-minion kube-proxy[629]: E0319 06:23:28.548287     629 proxier.go:563] Failed to install iptables KUBE-PORTALS-HOST rule for service "kubernetes-ro"
Mar 19 06:23:28 centos-minion kube-proxy[629]: E0319 06:23:28.548310     629 proxier.go:377] Failed to ensure portal for "kubernetes-ro": error checking rule: exit status 2: iptables v1.4.21: Port `:f816:3eff:fedf:8037]:47447' not valid
Mar 19 06:23:28 centos-minion kube-proxy[629]: Try `iptables -h' or 'iptables --help' for more information.
Mar 19 06:23:28 centos-minion kube-proxy[629]: E0319 06:23:28.555138     629 proxier.go:563] Failed to install iptables KUBE-PORTALS-HOST rule for service "kubernetes"
Mar 19 06:23:28 centos-minion kube-proxy[629]: E0319 06:23:28.555161     629 proxier.go:377] Failed to ensure portal for "kubernetes": error checking rule: exit status 2: iptables v1.4.21: Port `:f816:3eff:fedf:8037]:53103' not valid
Mar 19 06:23:28 centos-minion kube-proxy[629]: Try `iptables -h' or 'iptables --help' for more information.
Mar 19 06:23:28 centos-minion kube-proxy[629]: E0319 06:23:28.560348     629 proxier.go:563] Failed to install iptables KUBE-PORTALS-HOST rule for service "redis-master"
Mar 19 06:23:28 centos-minion kube-proxy[629]: E0319 06:23:28.560366     629 proxier.go:377] Failed to ensure portal for "redis-master": error checking rule: exit status 2: iptables v1.4.21: Port `:f816:3eff:fedf:8037]:37187' not valid
Mar 19 06:23:28 centos-minion kube-proxy[629]: Try `iptables -h' or 'iptables --help' for more information.
Mar 19 06:23:28 centos-minion kube-proxy[629]: E0319 06:23:28.565802     629 proxier.go:563] Failed to install iptables KUBE-PORTALS-HOST rule for service "redis-slave"
Mar 19 06:23:28 centos-minion kube-proxy[629]: E0319 06:23:28.565824     629 proxier.go:377] Failed to ensure portal for "redis-slave": error checking rule: exit status 2: iptables v1.4.21: Port `:f816:3eff:fedf:8037]:55949' not valid

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