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9.2

Deny TCP (no connection) from x.x.x.x to x.x.x.x flag SYN ACK on interface inside issue

Asked by rigneydolphin in Consumer Firewalls, Cisco PIX Firewall, TCP/IP

Tags: cisco, tcp no connection local-host

Hi,

I'm receiving the following error on our Cisco ASA 5520 ever since we moved our email traffic from our other ASA to this one. This seems only to be affecting TLS email coming from our email server, all other mail traffic is fine.

Anybody have any ideas? Could it be on the clients side?

Any help on this is much appreciated 
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7|Aug 12 2009 12:25:16|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:24:52|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:24:52|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/12283 flags SYN ACK  on interface inside
7|Aug 12 2009 12:24:52|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:24:40|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:24:40|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/12283 flags SYN ACK  on interface inside
7|Aug 12 2009 12:24:40|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:24:31|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:24:31|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/12283 flags SYN ACK  on interface inside
7|Aug 12 2009 12:24:31|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:24:27|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:24:27|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/12283 flags SYN ACK  on interface inside
7|Aug 12 2009 12:24:27|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:24:18|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:24:18|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/12283 flags SYN ACK  on interface inside
7|Aug 12 2009 12:24:18|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:21:50|609002: Teardown local-host outside:x.x.x.x duration 0:00:30
6|Aug 12 2009 12:21:50|302014: Teardown TCP connection 117683815 for outside:x.x.x.x/25 to inside:10.0.26.9/40070 duration 0:00:30 bytes 0 SYN Timeout
6|Aug 12 2009 12:21:38|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/12091 flags SYN ACK  on interface inside
6|Aug 12 2009 12:21:29|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/12091 flags SYN ACK  on interface inside
6|Aug 12 2009 12:21:26|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/12091 flags SYN ACK  on interface inside
6|Aug 12 2009 12:21:22|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/12091 flags SYN ACK  on interface inside
7|Aug 12 2009 12:21:19|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:21:19|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/12091 flags SYN ACK  on interface inside
7|Aug 12 2009 12:21:19|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:19:28|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:19:28|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/11967 flags SYN ACK  on interface inside
7|Aug 12 2009 12:19:28|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:19:25|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:19:25|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/11967 flags SYN ACK  on interface inside
7|Aug 12 2009 12:19:25|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:19:22|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
7|Aug 12 2009 12:19:19|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:19:19|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/11967 flags SYN ACK  on interface inside
7|Aug 12 2009 12:19:19|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:13:37|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:13:37|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/11476 flags SYN ACK  on interface inside
7|Aug 12 2009 12:13:37|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:13:25|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:13:25|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/11476 flags SYN ACK  on interface inside
7|Aug 12 2009 12:13:25|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:13:19|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:13:19|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/11476 flags SYN ACK  on interface inside
7|Aug 12 2009 12:13:19|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:13:09|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:13:09|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/11476 flags SYN ACK  on interface inside
7|Aug 12 2009 12:13:09|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:09:07|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:09:07|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/11096 flags SYN ACK  on interface inside
7|Aug 12 2009 12:09:07|609001: Built local-host outside:x.x.x.x
7|Aug 12 2009 12:09:04|609002: Teardown local-host outside:x.x.x.x duration 0:00:00
6|Aug 12 2009 12:09:04|106015: Deny TCP (no connection) from y.y.y.y/25 to x.x.x.x/11096 flags SYN ACK  on interface inside
7|Aug 12 2009 12:09:04|609001: Built local-host outside:x.x.x.x
[+][-]08/12/09 05:48 AM, ID: 25078119

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About this solution

Zones: Consumer Firewalls, Cisco PIX Firewall, TCP/IP
Tags: cisco, tcp no connection local-host
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Solution Provided By: asavener
Participating Experts: 1
Solution Grade: A
 
 
[+][-]08/12/09 06:02 AM, ID: 25078252

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[+][-]08/12/09 07:45 AM, ID: 25079257

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