Install Centos7 after install no SSH with Amazon EC2

if Centmin Mod's CSF Firewall is in test mode, tried waiting 5-10mins and relogging in via SSH could be CSF temp blocking you

after install check /etc/csf/csf.allow and see if your IP you're connecting from is auto whitelisted.. also could be CSF not detecting your IP properly. If you use dynamic IP and it changes often, see how to whitelist dynamic IPs in CSF Firewall CSF Firewall - CentminMod.com LEMP Nginx web stack for CentOS

did you change SSHD default 22 port ? manually OR via centmin.sh menu option 16? the latter auto adds the new SSHD default port number to /etc/csf/csf.conf TCP_IN comma separated whitelisted ports and auto removes port 22. If you did it manually, you'd have to manually add your new SSHD default port number to /etc/csf/csf.conf TCP_IN comma separated whitelist and remove port 22 from same listing and then restart CSF Firewall via csf -r command

 

FYI, I believe @jscott also uses Centmin Mod on AWS as well so he might have some additional tips

 

ah yes AWS Security Group needs at least port 22, 80 and 443 opened

edit: there's also a few other ports

• 9418 TCP for git
• 53 TCP/UDP for NSD DNS if you use it
• 25,993,465,587 etc for mail

you can see what CSF Firewall opens up at centminmod/csfinstall.inc at master · centminmod/centminmod · GitHub