Thu Dec 15 15:46:40 2011 us=406079 WARNING:
Since you are using --dev tun, the second argument to --ifconfig must be an IP address. You are using something (255.255.255.0) that looks more like a netmask. (silence this warning with --ifconfig-nowarn)
Thu Dec 15 15:46:40 2011 us=427386 There is a problem in your selection of --ifconfig endpoints [local=10.10.10.4, remote=255.255.255.0]. The local and remote VPN endpoints must exist within the same 255.255.255.252 subnet. This is a limitation of --dev tun when used with the TAP-WIN32 driver. Try 'openvpn --show-valid-subnets' option for more info.
Thu Dec 15 15:46:40 2011 us=427424 Exiting