Allow me to ping internet but browser have no internet reply

Question

hi all,
below is my config that it can ping internet (on inside network) or even trace to internet but can't open any site on the IE browser (i tested the client browser to a real internet and it works).
: Saved
: Written by enable_15 at 10:49:24.439 UTC Mon Apr 29 2013
ASA Version 8.6(1)2
hostname asa
domain-name abc.com
enable password NuLKvvWGg.x9HEKO encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
interface GigabitEthernet0/0
nameif outside
security-level 0
ip address 180.40.20.188 255.255.255.248
interface GigabitEthernet0/1
nameif dmz
security-level 50
ip address 10.0.80.1 255.255.255.0
interface GigabitEthernet0/2
nameif inside
security-level 100
ip address 10.0.90.1 255.255.255.0
interface GigabitEthernet0/3
shutdown
no nameif
no security-level
no ip address
interface GigabitEthernet0/4
shutdown
no nameif
no security-level
no ip address
interface GigabitEthernet0/5
shutdown
no nameif
no security-level
no ip address
interface Management0/0
nameif management
security-level 100
ip address 192.168.1.1 255.255.255.0
management-only
ftp mode passive
dns server-group DefaultDNS
domain-name abc.com
same-security-traffic permit inter-interface
same-security-traffic permit intra-interface
object network dmz-subnet
subnet 10.0.80.0 255.255.255.0
object network inside-subnet
subnet 10.0.90.0 255.255.255.0
access-list dmz_access_in extended permit icmp 10.0.80.0 255.255.255.0 10.0.90.0 255.255.255.0
pager lines 24
logging enable
logging asdm informational
mtu management 1500
mtu inside 1500
mtu dmz 1500
mtu outside 1500
no failover
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
object network dmz-subnet
nat (dmz,outside) dynamic interface
object network inside-subnet
nat (inside,outside) dynamic interface
access-group dmz_access_in in interface dmz
route outside 0.0.0.0 0.0.0.0 180.40.20.185 1
route dmz 10.0.80.0 255.255.255.0 10.0.80.1 10
route inside 10.0.90.0 255.255.255.0 10.0.90.1 10
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
dynamic-access-policy-record DfltAccessPolicy
user-identity default-domain LOCAL
http server enable
http 192.168.1.0 255.255.255.0 management
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart warmstart
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd address 192.168.1.2-192.168.1.254 management
dhcpd enable management
dhcpd address 10.0.90.2-10.0.90.50 inside
dhcpd dns 180.40.20.188 10.0.80.10 interface inside
dhcpd lease 200000 interface inside
dhcpd domain abc.com interface inside
dhcpd enable inside
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
webvpn
class-map inspection_default
match default-inspection-traffic
policy-map type inspect dns preset_dns_map
parameters
  message-length maximum client auto
  message-length maximum 512
policy-map global_policy
class inspection_default
  inspect dns preset_dns_map
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect rsh
  inspect rtsp
  inspect esmtp
  inspect sqlnet
  inspect skinny 
  inspect sunrpc
  inspect xdmcp
  inspect sip 
  inspect netbios
  inspect tftp
  inspect ip-options
  inspect icmp
service-policy global_policy global
prompt hostname context
no call-home reporting anonymous
Cryptochecksum:7685047e28784f23fe499fe943ae8480
: end
any comment is highly appreciated, thanks!

Answer 1

all of a sudden... it just work but i have to enter it in sequence...
hostname asa
domain-name abc.com
Interface GigabitEthernet0/1
  no shutdown
  nameif dmz
  security-level 50
  ip address  10.0.80.1 255.255.255.0
Interface GigabitEthernet0/0
  no shutdown
  nameif outside
  security-level 0
  ip address  180.40.20.188 255.255.255.248
same-security-traffic permit inter-interface
same-security-traffic permit intra-interface
nat (dmz,outside) after-auto 1 source dynamic any interface
route dmz 10.0.80.0 255.255.255.0 10.0.80.1 10
route management 192.168.1.0 255.255.255.0 192.168.1.1 10
route outside 0.0.0.0 0.0.0.0 180.40.20.185 1
logging enable
!icmp deny any echo-reply outside
policy-map global_policy
class inspection_default
inspect icmp
exit
exit
Interface GigabitEthernet0/2
  no shutdown
  nameif inside
  security-level 100
  ip address  10.0.90.1 255.255.255.0
dhcpd address 10.0.90.2-10.0.90.50 inside
dhcpd enable inside
dhcpd dns 180.40.20.185 10.0.80.10 interface inside
dhcpd lease 200000 interface inside
dhcpd ping_timeout 50 interface inside
dhcpd domain abc.com interface inside
nat (inside,outside) after-auto 2 source dynamic any interface
weird!!!