ASA5505 blocking return traffic

Our network has slowed to a crawl and upon investigation it looks as if the ASA5505 is blocking returning traffic. The syslog is full of these from legitimate sites:
2013-08-30 16:58:01 local4.critical 192.168.1.254  Aug 30 2013 16:53:38: %ASA-2-106001: Inbound TCP connection denied from 207.131.246.15/80 to aaa.bbb.ccc.xxx/46099 flags PSH ACK  on interface outside\n
2013-08-30 16:58:03 local4.critical 192.168.1.254  Aug 30 2013 16:53:40: %ASA-2-106001: Inbound TCP connection denied from 207.131.246.15/80 to aaa.bbb.ccc.xxx/31820 flags ACK  on interface outside\n
I'm not really sure where to go next so any help would be appreciated.
2013-08-30 16:58:01 local4.critical 192.168.1.254  Aug 30 2013 16:53:38: %ASA-2-106001: Inbound TCP connection denied from 207.131.246.15/80 to aaa.bbb.ccc.xxx/46099 flags PSH ACK  on interface outside\n
2013-08-30 16:58:03 local4.critical 192.168.1.254  Aug 30 2013 16:53:40: %ASA-2-106001: Inbound TCP connection denied from 207.131.246.15/80 to aaa.bbb.ccc.xxx/31820 flags ACK  on interface outside\n
We are also using Websense. I have a 'filter except' exception for the above examples (207.131.246.15) for both http and https. I have also reduced MTU to 1472 on the outside just to test. I also upgraded from 256 to 512 memory thinking maybe it was being stressed.
It seems to work for a while and then out of nowhere shuts everyone down from wherever they are browsing and then about 20 seconds to a minute later it starts up again.
I'm not really sure where to go next.
I have attached (what I hope is) a scrubbed config.
Thank you.

I looked for asymmetric routing. We have one other router attached to the internet but that just does VPN to a datacenter and has a specific route set up on the gateway for it. Nothing else should be getting to it other than the single IP address routed to it.
It seems to be affecting any ip address that needs a persistant connection. As an example I had to download Chrome to a PC this morning and it kept losing connection about 50% through the download. So from my experiments what I can tell is that it makes the first connection no problem, but quickly dies after that and a new connection has to be made. Also when this happens the IP address being accessed shows up in the "SYN Attack" list in ADSM. I have attached an image of the issue. The number one item on the list is a website we use all day long.

Similar Messages

  • ASA5505 - Blocking internal traffic between 2 servers

    Hi guys/ladies
    I have a cisco ASA5505, it runs a wide site to site VPN network and has 4 servers connected to it
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    10.50.15.5 > domain controller (exchange)
    10.50.15.6 > terminal server
    10.50.15.7 > terminal server
    Now yesterday i removed 10.50.15.6 and replaced it with a new terminal server with the same ip address, ever since the ASA is blocking traffic between it and the domain controller (example)
    2
    Oct 27 2012
    14:51:05
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    10.50.15.6
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    DNS
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    Any idea why all the sudden my ASA has decided to block the traffic between those machines? all the other machines can talk to it fine just not the domain controller, and seeing that this is a terminal server naturally you can see the problem i face!
    Any help you can give would be great as this router has worked flawlessly for 2 years now without any config changes and i cant work out why its blocking traffic between those 2 machines.

    Result of the command: "show cap asp | include 10.50.15.6"
      15: 10:09:21.796849 802.1Q vlan#1 P0 10.50.15.6.58810 > 10.50.15.5.389:  udp 163
      16: 10:09:22.189153 802.1Q vlan#1 P0 10.50.15.6.58810 > 10.50.15.5.389:  udp 163 Drop-reason: (acl-drop) Flow is denied by configured rule
      17: 10:09:22.596252 802.1Q vlan#1 P0 10.50.15.6.50855 > 10.50.15.5.53:  udp 86 Drop-reason: (acl-drop) Flow is denied by configured rule
      18: 10:09:23.625913 802.1Q vlan#1 P0 10.50.15.6.50855 > 10.50.15.5.53:  udp 86 Drop-reason: (acl-drop) Flow is denied by configured rule
      19: 10:09:24.625227 802.1Q vlan#1 P0 10.50.15.6.50855 > 10.50.15.5.53:  udp 86 Drop-reason: (acl-drop) Flow is denied by configured rule
      20: 10:09:26.635236 802.1Q vlan#1 P0 10.50.15.6.50855 > 10.50.15.5.53:  udp 86
      25: 10:09:30.653500 802.1Q vlan#1 P0 10.50.15.6.50855 > 10.50.15.5.53:  udp 86
      27: 10:09:34.655025 802.1Q vlan#1 P0 10.50.15.6.137 > 10.50.15.255.137:  udp 50 Drop-reason: (acl-drop) Flow is denied by configured rule
      28: 10:09:34.655071 802.1Q vlan#1 P0 10.50.15.6.138 > 10.50.15.255.138:  udp 237
      29: 10:09:34.655193 802.1Q vlan#1 P0 10.50.15.6.138 > 10.50.15.5.138:  udp 237 Drop-reason: (acl-drop) Flow is denied by configured rule
      30: 10:09:34.764700 802.1Q vlan#1 P0 10.50.15.6.49854 > 10.50.15.5.88: S 1487640872:1487640872(0) win 8192 Drop-reason: (acl-drop) Flow is denied by configured rule
      31: 10:09:34.899337 802.1Q vlan#1 P0 10.50.15.6.56407 > 10.50.15.5.53:  udp 34 Drop-reason: (acl-drop) Flow is denied by configured rule
      32: 10:09:35.901946 802.1Q vlan#1 P0 10.50.15.6.56407 > 10.50.15.5.53:  udp 34 Drop-reason: (acl-drop) Flow is denied by configured rule
      33: 10:09:36.915937 802.1Q vlan#1 P0 10.50.15.6.56407 > 10.50.15.5.53:  udp 34 Drop-reason: (acl-drop) Flow is denied by configured rule
      34: 10:09:37.773916 802.1Q vlan#1 P0 10.50.15.6.49854 > 10.50.15.5.88: S 1487640872:1487640872(0) win 8192 Drop-reason: (acl-drop) Flow is denied by configured rule
      35: 10:09:38.942715 802.1Q vlan#1 P0 10.50.15.6.56407 > 10.50.15.5.53:  udp 34 Drop-reason: (acl-drop) Flow is denied by configured rule
      37: 10:09:42.937695 802.1Q vlan#1 P0 10.50.15.6.56407 > 10.50.15.5.53:  udp 34 Drop-reason: (acl-drop) Flow is denied by configured rule
      38: 10:09:43.788579 802.1Q vlan#1 P0 10.50.15.6.49854 > 10.50.15.5.88: S 1487640872:1487640872(0) win 8192 Drop-reason: (acl-drop) Flow is denied by configured rule
      41: 10:09:55.803608 802.1Q vlan#1 P0 10.50.15.6.54962 > 10.50.15.5.53:  udp 86 Drop-reason: (acl-drop) Flow is denied by configured rule
      42: 10:09:56.814166 802.1Q vlan#1 P0 10.50.15.6.54962 > 10.50.15.5.53:  udp 86 Drop-reason: (acl-drop) Flow is denied by configured rule
      43: 10:09:57.820804 802.1Q vlan#1 P0 10.50.15.6.54962 > 10.50.15.5.53:  udp 86 Drop-reason: (acl-drop) Flow is denied by configured rule

  • Cisco RV042 Firewall Blocking LAN Traffic

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    Action
    Service
    Source
    Interface
    Source
    Destination
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    Day
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    123
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    LAN
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    10.10.10.10 ~ 10.10.10.10
    Always
    123
    Allow
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    LAN
    10.10.10.10 ~ 10.10.10.10
    10.10.21.1 ~ 10.10.21.31
    Always
    123
    Allow
    All Traffic [1]
    LAN
    Any
    Any
    Always
    Allow
    All Traffic [1]
    LAN
    Any
    Any
    Always
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    Any
    Any
    Always
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    Any
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    config-file-header
    SWITCH01
    v1.3.5.58 / R750_NIK_1_35_647_358
    CLI v1.0
    set system mode router
    vlan database
    vlan 2
    exit
    no bonjour enable
    hostname SWITCH01
    no logging console
    ip ssh server
    ip ssh password-auth
    clock timezone CEST +1
    interface vlan 1
    ip address 10.10.10.2 255.255.255.0
    no ip address dhcp
    interface vlan 2
    name VIRTUAL-MANAGEMENT
    ip address 10.10.21.1 255.255.255.224
    interface gigabitethernet1
    description ESXI01:VMNIC0:MGMT
    switchport trunk allowed vlan add 2
    interface gigabitethernet20
    description UPLINK
    exit
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    Default Gateway
    Hop Count
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    255.255.255.224
    10.10.10.2
    1
    eth0
    10.10.10.0
    255.255.255.0
    0
    eth0
    255.255.252.0
    0
    eth1
    239.0.0.0
    255.0.0.0
    0
    eth0
    default
    0.0.0.0
    40
    eth1
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  • ASA 5505 9.1(2) NAT/return traffic problems

    As part of an office move we upgraded our ASA to 9.1(2) and have been having what seem to be NAT problems with some services ever since. These problems manifest themselves with return traffic. For example, network time sync (NTP, port 123) works fine from the ASA, but hosts on the inside network cannot access external NTP servers (ntpq -pe shows all servers stuck in .INIT. status), creating problems with drifting clocks. Services like XBox Live also do not work; the XBox device can contact the internet, but return traffic from the service never gets back to the device.
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    DHCP ASSIGNED IP from ISP <----------> ASA <-----------------> inside (192.168.50.X)
                                                                      ^
                                                                     |----------------------- guest vlan (10.0.1.X)
    show running-config:
    Result of the command: "show running-config"
    : Saved
    ASA Version 9.1(2)
    hostname border
    domain-name mydomain.com
    enable password aaa encrypted
    passwd bbb encrypted
    names
    interface Ethernet0/0
    switchport access vlan 2
    interface Ethernet0/1
    switchport trunk allowed vlan 1,3
    switchport trunk native vlan 1
    switchport mode trunk
    interface Ethernet0/2
    interface Ethernet0/3
    interface Ethernet0/4
    interface Ethernet0/5
    interface Ethernet0/6
    interface Ethernet0/7
    interface Vlan1
    nameif inside
    security-level 100
    ip address 192.168.50.1 255.255.255.0
    interface Vlan2
    nameif outside
    security-level 0
    ip address dhcp setroute
    interface Vlan3
    nameif Guest-VLAN
    security-level 10
    ip address 10.0.1.1 255.255.255.0
    boot system disk0:/asa912-k8.bin
    boot system disk0:/asa911-k8.bin
    boot system disk0:/asa831-k8.bin
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    clock timezone EST -5
    clock summer-time EDT recurring
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    same-security-traffic permit inter-interface
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    object network Guest-WLAN
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    object network xbox-nat-tcp3074
    host 192.168.50.54
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    host 192.168.50.54
    object network xbox-nat-udp88
    host 192.168.50.54
    object service xbox-live-88
    service udp destination eq 88
    object network xbox
    host 192.168.50.54
    object network obj-inside
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    object network obj-xbox
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    object network plex-server
    host 192.168.50.5
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    object network ntp
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    object network plex
    host 192.168.50.5
    object network INTERNET
    subnet 0.0.0.0 0.0.0.0
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    port-object eq 3074
    object-group protocol TCPUDP
    protocol-object udp
    protocol-object tcp
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    port-object eq 32400
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    access-list outside_access_in extended permit object xbox-live-88 any object xbox log alerts
    access-list outside_access_in extended permit tcp any any eq echo
    access-list outside_access_in remark Plex Live access
    access-list outside_access_in extended permit tcp any object plex-server object-group plex-server-32400
    access-list outside_access_in extended permit icmp any any time-exceeded
    access-list outside_access_in extended permit icmp any any unreachable
    access-list outside_access_in extended permit icmp any any echo-reply
    pager lines 24
    logging enable
    logging asdm informational
    mtu inside 1500
    mtu outside 1500
    mtu Guest-VLAN 1500
    no failover
    icmp unreachable rate-limit 1 burst-size 1
    asdm image disk0:/asdm-713.bin
    no asdm history enable
    arp timeout 14400
    no arp permit-nonconnected
    object network xbox-nat-tcp3074
    nat (inside,outside) static interface service tcp 3074 3074
    object network xbox-nat-udp3074
    nat (inside,outside) static interface service udp 3074 3074
    object network xbox-nat-udp88
    nat (inside,outside) static interface service udp 88 88
    object network plex
    nat (inside,outside) static interface service tcp 32400 32400
    object network INTERNET
    nat (inside,outside) dynamic interface
    nat (Guest-VLAN,outside) after-auto source dynamic any interface
    access-group outside_access_in in interface outside
    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
    no user-identity enable
    user-identity default-domain LOCAL
    aaa authentication ssh console LOCAL
    aaa authentication telnet console LOCAL
    http server enable
    http 192.168.50.0 255.255.255.0 inside
    no snmp-server location
    no snmp-server contact
    snmp-server enable traps snmp authentication linkup linkdown coldstart warmstart
    crypto ipsec security-association pmtu-aging infinite
    crypto ca trustpoint _SmartCallHome_ServerCA
    crl configure
    crypto ca trustpoint ASDM_TrustPoint0
    enrollment self
    subject-name CN=border
    crl configure
    crypto ca trustpool policy
    crypto ca certificate chain _SmartCallHome_ServerCA
    certificate ca xxxx
      quit
    crypto ca certificate chain ASDM_TrustPoint0
    certificate xxxx
      quit
    crypto ikev2 remote-access trustpoint ASDM_TrustPoint0
    telnet timeout 5
    ssh 192.168.50.0 255.255.255.0 inside
    ssh timeout 5
    ssh key-exchange group dh-group1-sha1
    console timeout 0
    vpn-addr-assign local reuse-delay 60
    dhcp-client client-id interface outside
    dhcpd auto_config outside
    dhcpd address 192.168.50.5-192.168.50.132 inside
    dhcpd address 10.0.1.50-10.0.1.100 Guest-VLAN
    dhcpd dns 208.104.244.45 208.104.2.36 interface Guest-VLAN
    dhcpd lease 86400 interface Guest-VLAN
    dhcpd enable Guest-VLAN
    threat-detection basic-threat
    threat-detection scanning-threat shun except ip-address 192.168.50.0 255.255.255.0
    threat-detection statistics
    threat-detection statistics tcp-intercept rate-interval 30 burst-rate 400 average-rate 200
    ntp server 152.19.240.5 source outside prefer
    ssl trust-point ASDM_TrustPoint0 outside
    username xxx password xxx/ encrypted privilege 15
    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 icmp
    service-policy global_policy global
    prompt hostname context
    service call-home
    call-home reporting anonymous
    call-home
    contact-email-addr [email protected]
    profile CiscoTAC-1
      destination address http https://tools.cisco.com/its/service/oddce/services/DDCEService
      destination address email [email protected]
      destination transport-method http
      subscribe-to-alert-group diagnostic
      subscribe-to-alert-group environment
      subscribe-to-alert-group inventory periodic monthly
      subscribe-to-alert-group configuration periodic monthly
      subscribe-to-alert-group telemetry periodic daily
    hpm topN enable
    Cryptochecksum:xxx
    : end

    Hi,
    Configuration seems fine.
    With regards to the ICMP, you could also add this
    class inspection_default
      inspect icmp error
    I would probably start by trying out some other software level on the ASA
    Maybe some 8.4(x) software or 9.0(x) software. See if it some bug perhaps.
    One option is ofcourse to capture traffic directly on the ASA or on the hosts behind the ASA. And go through the information with Wireshark.
    - Jouni

  • BT is blocking specific traffic - Connection probl...

    I started having this problem about two weeks ago, after multiple phonecalls to BT and a couple of emails nothing has been done, so hopefully someone on the forum can help.
    The problem is the BT server that my hub connects to runs software to block specific traffic, I assume this is handy for restricted torrents or illegal downloads. But what it's blocking is a game called EVE Online, I used to play this game without a single problem until about two weeks ago. I logged in one day and the lag was unbearable, mainly due to the fact BT is blocking around 90% of packets that are sent to me. As I said, I used to be able to play no problem, but now I can't even go on for 2 minutes before I get kicked.
    I've confirmed with the EVE support team that BT is causing the problem, EVE uses UDP and it only requires a packet loss of 5 consecutive packets before the game disconnects you. This may not seem like a lot, but due to the nature of it, any more than 5 packets can cause major problems in the game, so they just disconnect you. A friend of mine also had this problem, but to a lesser extent, but it did span accross multiple games, he has since then switched to another broadband provider which I will not name, and hasn't had the issue since. In EVE, recently BT have been known to block traffic, I'm not the first to ask EVE support for assistance on the matter, so they weren't strangers to the problem.
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    500 trace count, 1 second per trace.
    Packet loss is highlighted in RED
    BT IP's are highlighted in BLUE
    EVE IP's are highlighted in GREEN
    Target Name: srv200-g.ccp.cc
    IP: 87.237.38.200
    Date/Time: 21/01/2014 2:41:46 AM to 21/01/2014 2:50:12 AM
    Hop Sent Error    PL%  Min Max Avg  Host Name / [IP]
     1   500      0      0.0      1   34    2  BThomehub.home [192.168.1.254]  PC TO HUB 
     2   500    423    84.6    9   57   21  esr19.edinburgh8.broadband.bt.net [213.1.130.142] HUB TO BT
     3   500    474    94.8   10  149  26  [213.1.130.125]
     4   500    480    96.0   18   66   29  [213.1.69.74]
     5   500    481    96.2   19   63   31  [31.55.165.77]
     6   500    476    95.2   19   71   35  [31.55.165.107]
     7    14     11     78.6    18   53   29  acc1-10GigE-4-1-3.mr.21cn-ipp.bt.net [109.159.250.114]
     8   133    126    94.7   29   62   47  core2-te0-13-0-14.ilford.ukcore.bt.net [109.159.250.46]
     9   262    238    90.8   27   69   47  peer3-te0-1-0-7.telehouse.ukcore.bt.net [109.159.254.251]
    10  500    443    88.6   25    74   40  ccpgames.com [195.66.226.23]
    11  500    465    93.0   25    69   42  te-d2-e2.ccp.cc [87.237.37.246]
    12  500    422    84.4   25    77   38  srv200-g.ccp.cc [87.237.38.200]
    As you can see, that is completely unacceptable. The connection between my PC to my HUB is perfect, from the HUB to BT is where things go pearshaped.
    Onto another note, the three times I've phoned, I've spoken to someone reading from a card. What I mean by that is they haven't got a clue what they're speaking about. They are denying there is a problem because 'ping google' works fine. the first time I was redirected to the tech support, but then found out I wasn't paying for the service so I couldn't use it. The second time the advisor hung up on me when I requested to speak to her supervisor, and the third I hung up because the advisor claimed BT broadband isn't designed to support online gaming, and he said a 90% packet loss is to be expected when online gaming, alright then.
    Any help whatsoever on this issue is greatly appreciated, If I've missed anything out just ask for it and i'll post it
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