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I'm executed this commands with root user i'm on a CentOS 6.3 server:

#useradd newuser
#passwd newuser


then I added this line at end of file:

AllowUsers newuser

#service sshd restart

Now, I can't access server with deployer or root user! Both accounts return:

**Permission denied, please try again.**

Any suggestions?

EDIT: Why add AllowUsers newuser dont allows newuser to login by ssh?

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suggestions to do what? fix the "cannot login" issue or "allow root to log in"? – chutz Dec 12 '12 at 16:13
check your logs for a better error – Mike Dec 12 '12 at 16:15
@chutz, It's possible to work around this problem and can login again by ssh? – Rodrigo Dec 12 '12 at 16:27
Enable root to login via ssh in /etc/ssh/sshd_config PermitRootLogin:yes and see if you can get in with root. – cole Dec 12 '12 at 16:33

AllowUsers, quoting man sshd_config, "If specified, [allows] only user names that match one of the patterns".

To work around the problem, try logging in as newuser, and then use sudo -i (if newuser is allowed to run the command) or su root (if you know the root password) to become root and take the AllowUsers line out. After modifying sshd_config, restart sshd.

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But I can't access server with newuser user – Rodrigo Dec 12 '12 at 16:24
Can you get on to the server at all? Are you still logged in? – jim_m_somewhere Dec 12 '12 at 19:36

Make sure port 22 is open:

netstat -tulpn | grep :22

I'm assuming you have not turned off iptables. You can either a.) turn them off

service iptables save
service iptables stop
chkconfig iptables off

Or, add a rule:

vi /etc/sysconfig/iptables
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
service iptables restart

Then restart ssh, root login via ssh is disable by default (usually) so you would need to edit the ssh config if you want root login:

vi /etc/ssh/sshd_config
share|improve this answer
"Permission denied" is normally not related to connectivity issues. – chutz Dec 12 '12 at 16:31

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