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Cannot reach any cloud image instance with floating IP except ping

I setup a test 3 nodes openstack test environment. I can launch, ping and ssh to CirrOS instance with floating IP. After that I created a instance with ubuntu cloud image. When launch the instance I create a new user and write the instance SSHD config file to enable password auth with cloud config script .

Now I can ping the ubuntu instance, but can not ssh to the instance with floating IP. I can ssh to the CirrOS instance first and in the cirros instance I can ssh to the ubuntu instance with private IP.

I checked the security group. The CirrOS and ubuntu instance are in the same group. When I ssh to the ubuntu instance with private IP, I checked the iptables, the iptables is disabled.

Any ideas about that?