Its seems my router did not support NVI or maybe there is a bug of NVI in my router software so my command got deleted automatically. The solution is using classic hairpinThanks all for helping me, really appreciate it. 

Hi Paul, thank you so much for your help.i am trying to apply your example. its same as NVI let me check it. hope it works more stablethank you Paul.

interface GigabitEthernet0/0 no ip nat outside no ip redirects ip nat enable!interface GigabitEthernet0/1 no ip nat inside no ip redirects ip nat enable!ip access-list extended NAT permit ip 10.10.9.0 0.0.0.255 any permit ip 10.20.0.0 0.0.255.255 any...

my config before is using ip nat inside source.. however, i need my server to be able access server public ip (i map it to virtual IP) internally.following this tips:https://community.cisco.com/t5/routing/how-to-do-nat-reflection-nat-hairpin-on-a-c...

Hello Paul, thanks for replying.How to check it? my router version is 15.4(3).M3