Error: User add failed. Cannot add user on this node: FAILED: to establish SSH session

Make sure iptables / firewall is not blocking ssh traffic

Add the following to allow localhost in iptables / firewall

root@gateway :~# iptables -A INPUT -p tcp -s localhost -j ACCEPT

root@gateway :~# csf -a 127.0.0.1

Check if you are able to ssh " ssh root@localhost " / " ssh [email protected] " (Specify the ssh port with -p variable if you are using a custom SSH port)

Make sure SSHD is not blocked in /etc/hosts.allow or /etc/hosts.deny

Add the following to allow localhost in /etc/hosts.allow or /etc/hosts.deny

sshd : localhost : allow

If you are using custom sshd port in your gateway, then make sure its updated under Settings->Miscellaneous->SSH Gateway Port is set to the current SSHD listening port on the ssh gateway server.

Check your ssh port with the following command

[root@gateway ~]# cat /etc/ssh/sshd_config | grep Port

# Port 22

#Gateway Ports no

If you are using custom ssh port ,make sure its updated under Settings->Miscellaneous->SSH Gateway Port