Clents from specific site loosing internet access randomly

Hi, this is happening for a while on one of our site. First, here's an overview of our setup
The problem is happening on clients of 12.x subnet. So randomly some clients can't browse internet sites. It happens for 30min-1h and then comes back by itself.
Doesn't seem to be a routing issue as when the problem is happening I can still ping internet IPs
Doesn't seem to be DNS related as I can resolve LAN and WAN DNS names from the problematic machine
I also looked at my 3 DNS servers and A records are correct ith the correct IP for the client PC
Browsing web sites on LAN is working fine
The problem NEVER happened on the other site (subnet 8.x)
When it's happening it's only to 1,2 or 3 clients and all others of the same subnet are working perfectly
On TMG log, we can see traffic between the client and TMG but with "SYN packet was dropped because it was sent by a source that does not have an established connection with the Forefront TMG computer." errors. As soon as the client PC becomes alive
again, the log doesn't show these "non-SYN" errors again.

Hi,
It sounds odd.
How many clients access the internet at the same time? Does the issue exist all the time?
Which version of TMG do you use?Upgrade to the latest version may help you aviod this strange issue.
Best Regards
Quan Gu

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Cisco Adaptive Security Appliance Software Version 9.1(4)
Device Manager Version 7.1(5)
Compiled on Thu 05-Dec-13 19:37 by builders
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: Saved
ASA Version 9.1(4)
hostname ASA5510
domain-name
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xlate per-session deny tcp any4 any6
xlate per-session deny tcp any6 any4
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xlate per-session deny udp any6 any6 eq domain
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names
dns-guard
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description WAN Interface
nameif Outside
security-level 0
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dns server-group DefaultDNS
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object network inside-net
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description Inside Network Object
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access-list INSIDE-IN extended permit ip any any
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mtu Outside 1500
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nat (Inside,Outside) dynamic interface
access-group INSIDE-IN in interface Inside
access-group OUTSIDE-IN in interface Outside
router rip
network 10.0.0.0
network 199.199.199.0
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no auto-summary
route Outside 0.0.0.0 0.0.0.0 199.199.199.113 1
route Inside 172.16.10.0 255.255.255.0 10.10.1.2 1
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timeout xlate 3:00:00
timeout pat-xlate 0:00:30
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
aaa authentication ssh console LOCAL
http server enable
http 0.0.0.0 0.0.0.0 Inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association pmtu-aging infinite
crypto ca trustpool policy
telnet timeout 5
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ssh timeout 60
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ssh key-exchange group dh-group1-sha1
console timeout 0
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
username <redacted> password <redacted> encrypted privilege 15
class-map inspection_default
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policy-map type inspect dns migrated_dns_map_1
parameters
message-length maximum client auto
message-length maximum 512
policy-map global_policy
class inspection_default
inspect dns migrated_dns_map_1
inspect ftp
inspect h323 h225
inspect h323 ras
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inspect rtsp
inspect esmtp
inspect sqlnet
inspect skinny
inspect sunrpc
inspect xdmcp
inspect sip
inspect netbios
inspect tftp
inspect ip-options
service-policy global_policy global
prompt hostname context
no call-home reporting anonymous
call-home
profile CiscoTAC-1
no active
destination address http
https://tools.cisco.com/its/service/oddce/services/DDCEService
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[email protected]
destination transport-method http
subscribe-to-alert-group diagnostic
subscribe-to-alert-group environment
subscribe-to-alert-group inventory periodic monthly
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subscribe-to-alert-group telemetry periodic daily
password encryption aes
Cryptochecksum:
<redacted>
: end
SH NAT:
ASA5510# sh nat
Manual NAT Policies (Section 1)
1 (Inside) to (Outside) source dynamic any interface
    translate_hits = 0, untranslate_hits = 0
Auto NAT Policies (Section 2)
1 (Inside) to (Outside) source dynamic inside-net interface
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nat (Inside,Outside) source dynamic any interface
object network inside-net
nat (Inside,Outside) dynamic interface
SH RUN OBJECT:
ASA5510(config)# sh run object
object network inside-net
subnet 10.0.0.0 255.255.255.0
description Inside Network Object
Hi all,Hello everyone, I need some help before my head explodes. Idddddddd

Hello Mitchell,
First of all how are you testing this:
interface Ethernet0/0
description LAN Interface
nameif Inside
security-level 100
ip address 10.10.1.1 255.255.255.252
Take in consideration that the netmask is /30
The Twice NAT is good, ACLs are good.
do the following and provide us the result
packet-tracer input inside tcp 10.10.1.2 1025 4.2.2.2 80
packet-tracer input inside tcp 192.168.1.100 1025 4.2.2.2 80
And provide us the result!
Looking for some Networking Assistance?
Contact me directly at [email protected]
I will fix your problem ASAP.
Cheers,
Julio Carvajal Segura
Note: Check my website, there is a video about this that might help you.
http://laguiadelnetworking.com

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I have one Router (from the internet provider so not apple) connected to an ADSL line with ethernet hardwired Conections to both Airport express.
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Clents from specific site loosing internet access randomly

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