fail2ban problem

Hi all

I've following int the fail2ban log:

Code:

2009-10-16 15:10:51,014 fail2ban.filter : WARNING Unable to find a corresponding IP address for ns.profisit.cz

It seems, that could not resolve the name or ip.

How could I fix that?

Thanks
admins

 

no, it isn't

 

For all

I't was perhaps an temporary dns error.
Lets have a look.

admins