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devstack vm instance ssh error message

ssh: connect to host x.x.x.x port 22: Connection on refused

I get this error when i try to ssh from my devstack (using OVN) controller node towards my VM instances. I can ping the IPs but ssh is not successful.

ssh -i OVNkey3.pem ubuntu@x.x.x.x -v OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n 7 Dec 2017 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug1: Connecting to x.x.x.x [x.x.x.x] port 22. debug1: Connection established. debug1: key_load_public: No such file or directory debug1: identity file OVNkey3.pem type -1 debug1: key_load_public: No such file or directory debug1: identity file OVNkey3.pem-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 ssh_exchange_identification: read: Connection reset by peer