We have the required packages in our repo:

-rw-r--r-- 1 root root 35012 Jul 16 18:40 courier-authlib-userdb-0.64.0-1.el6.i686.rpm
-rw-r--r-- 1 root root 35224 Jul 16 18:40 courier-authlib-userdb-0.64.0-1.el6.x86_64.rpm


I've rebuilt the lists just in case (yum clean all), don't know what else I can do for you.

It's TCP, TCPv6 to be precise. Try setting your public IP address in /etc/courier/pop3d (ADDRESS=...) and restarting courier-pop

No, that's not necessary.

It's not possible to do right away, but here's a solution: http://stackoverflow.com/questions/1913984/re-assign-host-access-permission-to-mysql-user

Check whether your user is allowed to connect from localhost (as opposed to unix socket used by mysql utility).

Ajenti V doesn't set or change root password. You can login with mysql -uroot -pyourpassword

General root of ajenti installation is $PYTHONPATH/ajenti
HTML templates and static files are in ajenti/plugins/main/static
Coffeescript control templates are mostly in ajenti/plugins/main/content/js
LESS stylesheets are mostly in ajenti/plugins/main/content/css

Have you restarted Ajenti?