Cluster with to nodes vmware and openstack

I installed a kubernetes cluster with this configuration
In my local network
Master ==> in a vmware VM
Node 1 ==> in a second vm vmware
Do join successfully
In my firewall I made a Nat for the private ip address of the Master to a public address
Then in the openstack clood I created an Ubuntu instance
Now I tried to join this machine as a second nod for my cluster
The ping works in both directions from the Master and to the instance
But the join not
It remains blocked without answer
Is there any other config to do
Thanks for sharing a tutorial