OpenVPN Server Configuration on CentOS 6+

Installing OpenVPN on CentOS 6? Looking for guides? Finding that things don't quite work right? I have the following notes that I am going to aggregate into a detailed post later on, but in the meantime, this may help you quite a bit.

In client config file, you have to add:

auth-user-pass

In order for the client to prompt for username/password (using local linux users)

The root account cannot login through the client by default. I would suggest keeping it this way.

The client config exported by the current webmin OpenVPN module does NOT add the ^M characters at the end of the lines of the client config file all the time. Windows Clients NEED this.

In iptables using Webmin allow FORWARD and INPUT chains to tun0 (or tun1 or whatever) without restriction.

Resources:

http://freevps.us/thread-9163.html

http://openvpn.net/index.php/open-source/documentation/howto.html

http://serverfault.com/questions/358855/how-to-prevent-users-from-sharing-certificates-in-openvpn

http://www.slsmk.com/openvpn-with-id-and-password-authentication/