[CentOS] SSH AllowUser WildCard

[Gordon Messmer]

On 02/07/2011 09:37 PM, Stephen Cox wrote:
> Feb  7 18:17:25 server sshd[3537]: reverse mapping checking
> getaddrinfo for AA-xxx-xxx-xxx-xxx.AAAA.host.com failed - POSSIBLE
> BREAKIN ATTEMPT!

That message indicates that the IP address from which you're connecting 
has a PTR record of "AA-xxx-xxx-xxx-xxx.AAAA.host.com", but that 
hostname doesn't resolve to that IP address (or doesn't resolve at all).

You'll need to set up DNS properly for this to work.