Unable access local server through Public IP after configured policy route

Hi All,

i recently subscribe a new ISP For secondly WAN line, below is my config related to that two WAN line and my routing rules,all machine under VLAN12 are able to access access and my local server without any issues. but i cannot access my local server through Public IP after i add the policy route(Front colour Blue) to force my vlan12 network to specific WAN line(Port8),vlan12 network had been successful force route to Port8 WAN line.

Anyone got idea for this ?

config router policy     edit 8         set input-device "vlan12"         set src "172.16.12.0/24"         set dst "0.0.0.0/0.0.0.0"         set output-device "port8"

config firewall vip edit "EXCHANGESVR"         set extip 202.xxx.xxx.xxx         set extintf "port8"         set mappedip "172.16.12.10" config firewall policy         edit 81         set srcintf "port8"         set dstintf "vlan12"         set srcaddr "all"         set dstaddr "EXCHANGESVR"         set action accept         set schedule "always"         set service "SMTP" "SMTPS" "HTTPS" "HTTP" "ALL_ICMP" "ALL_ICMP6"         set utm-status enable         set av-profile "exchangeAD"         set spamfilter-profile "ExchangeEmail"         set ips-sensor "exchangeSMTPIPS"         set profile-protocol-options "ServerProxy"         set ssl-ssh-profile "default"     next edit 84         set srcintf "vlan12"         set dstintf "port8" "Maxis"         set srcaddr "vlan12_network"         set dstaddr "all"         set action accept         set schedule "always"         set service "ALL"         set logtraffic all         set nat enable     next config system interface     edit "port8"         set vdom "root"         set ip 202.xxx.xxx.xxx 255.255.255.252         set allowaccess ping https         set type physical         set spillover-threshold 50         set weight 50         set snmp-index 13     next     edit "Maxis"         set vdom "root"         set mode pppoe         set distance 10         set allowaccess ping https         set fail-detect enable         set fail-detect-option detectserver         set spillover-threshold 50         set weight 50         set snmp-index 4         set username "xxxxxxxxxxxxxxxxx"         set password ENC xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx         set interface "wan2"         set vlanid 621     next end config router static     edit 5         set gateway 202.xxx.xxx.xxx         set device "port8"     next end