Road Warrior w/ client-specific configuration - HOWTO?

[pfman]

I have a couple problem with setting road warrior using client-specific config.

1. I setup the server OpenVPN with address pool 192.168.5.0/24, road warriors work great. Then I create a client-specific configuration with Interface IP 192.168.10.0/30 for 1 remote machine. I use the same common name as when I create the PKI. The machine did receive the IP (192.168.10.2) but it can not access any machine

2. After I deleted the client-specific config (the list is now empty) and try connect again, this particular remote machine is still able to connect and get 192.168.10.2

How can I set up the client-specific configuration ? and why OpenVPN server still granting the IP address which has been removed for the server's configuration?

Please help

Thanks!