I recently cloned two AWS CentOS 7 instances from a physical server. From the first AWS instance, I can telnet on port 22 to the second AWS instance. From the second AWS instance, I cannot telnet to the first AWS instance.
[root@secondservername etc]# telnet 10.xxx.yyy.zzz 22 Trying 10.xxx.yyy.zzz...
The iptables firewalls are accepting INPUT, FORWARDING, OUTPUT on both instances. There is no /etc/host.deny configs. There are no TCP wrappers. The identical security group allowing port 22 access for anything is in place. /etc/ssh/sshd_config Allow root access Yes is in place and the problem persists with non-root users.
These instances are exact copies of the original bare-metal server.
I was wondering if there were any thoughts on this?