'Failed to establish SSH session ' error ; unable ssh via ezeelogin shell 

• Make sure iptables / firewall is not blocking ssh traffic (check ssh port is open on both gateway & target server)and make sure SSHD is not blocked in /etc/hosts.allow or /etc/hosts.deny
• Make sure that selinux is disabled on jumpbox/gateway server and target server.You can find it by typing 'sestatus'