I am a total newbie with OpenVPN
are you a newbie in general or with openvpn only?
I want my VPN tunnels to stay alive and I read that I should use the keepalive command
assuming you are talking about openvpn tunnels...
So I launched a PuTTY session to the OpenVPN server and typed "keepalive 10 300"
a putty session (meaning an ssh based session) has nothing to do with the openvpn session you have opened,
anyway the keepalive is an openvpn directive , meaning that it should entered inside your openvpn config.
keep reading my friend...
Michael.