sewaktu mencoba dial ke vpn hasil postingan sebelumnya..,
saya mendapatkan pesan error

Unable to connect because your certificate is not yet valid. Check that your system time is correct

yah, coba-coba liat masalahnya dimana, dial berulang-ulang, cek waktu di VPS dan di komputer saya sendiri, tidak ada masalah.
ternyata masalah-nya mulai terlihat sewaktu saya mencoba melihat proses openVPN ini, ada dua proses

#ps aux | grep vpn
[root@arielfx ~]# ps aux | grep vpn
root      1842  0.0  0.0   5548   696 ?        Ss   13:49   0:00 /usr/sbin/openvpn --daemon --writepid /var/run/openvpn/server.pid --config server.conf --cd /etc/openvpn
root      1974  0.0  0.0   5548   696 ?        Ss   13:49   0:00 /usr/sbin/openvpn --daemon --writepid /var/run/openvpn/server.pid --config server.conf --cd /etc/openvpn
root      1903  0.0  0.0   3096   720 pts/0    R+   14:16   0:00 grep vpn

saya coba untuk menghentikan service openVPN

[root@arielfx ~]#/etc/init.d/openvpn stop

terus saya coba lagi, lihat prosesnya

[root@arielfx ~]# ps aux | grep vpn
root      1842  0.0  0.0   5548   696 ?        Ss   13:49   0:00 /usr/sbin/openvpn --daemon --writepid /var/run/openvpn/server.pid --config server.conf --cd /etc/openvpn
root      1903  0.0  0.0   3096   720 pts/0    R+   14:16   0:00 grep vpn

kill prosess service ninja tanpa bayangan tersebut (hehe), dan periksa kembali

[root@arielfx pam.d]# kill 1842
[root@arielfx pam.d]# ps aux | grep vpn
root      1913  0.0  0.0   3096   720 pts/0    R+   14:17   0:00 grep vpn

Ok, sudah bersih, mari kita coba dial ke openvpn, sebelumnya aktifkan VPN server-nya dengan cara manual

[root@arielfx ~]# openvpn /etc/openvpn/server.conf

Hasilnya:

Wed Jul 18 15:21:47 2012 OpenVPN 2.0.9 i386-redhat-linux [SSL] [LZO] [EPOLL] built on Jul 18 2012
Wed Jul 18 15:21:47 2012 PLUGIN_INIT: POST /usr/share/openvpn/plugin/lib/openvpn-auth-pam.so '/etc/pam.d/login' intercepted=PLUGIN_AUTH_USER_PASS_VERIFY
Wed Jul 18 15:21:47 2012 Diffie-Hellman initialized with 1024 bit key
Wed Jul 18 15:21:47 2012 WARNING: This configuration may accept clients which do not present a certificate
Wed Jul 18 15:21:47 2012 TLS-Auth MTU parms [ L:1574 D:138 EF:38 EB:0 ET:0 EL:0 ]
Wed Jul 18 15:21:47 2012 TUN/TAP device tun0 opened
Wed Jul 18 15:21:47 2012 /sbin/ifconfig tun0 192.168.1.1 pointopoint 192.168.1.2 mtu 1500
Wed Jul 18 15:21:47 2012 /sbin/route add -net 192.168.1.0 netmask 255.255.255.0 gw 192.168.1.2
Wed Jul 18 15:21:47 2012 Data Channel MTU parms [ L:1574 D:1450 EF:42 EB:135 ET:32 EL:0 AF:3/1 ]
Wed Jul 18 15:21:47 2012 UDPv4 link local (bound): 234.234.234.234:2342
Wed Jul 18 15:21:47 2012 UDPv4 link remote: [undef]
Wed Jul 18 15:21:47 2012 MULTI: multi_init called, r=256 v=256
Wed Jul 18 15:21:47 2012 IFCONFIG POOL: base=192.168.1.4 size=62
Wed Jul 18 15:21:47 2012 Initialization Sequence Completed

Ok berhasil, Silahkan coba dial menggunakan OpenVPN GUI anda

NB: Budayakan komentar ya ^_^