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Openstack nova - telnet: Unable to connect to remote host: Connection refused

I want to enable telnet port on my virtual machines. I used the command

nova secgroup-add-rule default icmp -1 -1 0.0.0.0/0

to enable ping. And with the command

nova secgroup-list-rules default

I can see the table with enabled port (80 and 22).

On my virtual machine if I use the command

telnet localhost

or

telnet ip_value num_port

I always have the message "telnet: Unable to connect to remote host: Connection refused"

How can I enable this connection?