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Unusual problem with ASA 5505

  • Routers
  • Internet Service Providers
  • TCP/IP
  • Networking
Last response: in Networking
November 5, 2009 1:49:03 PM


I'm having this very unusual problem with ASA 5505.
ASA was configured almost two years ago. No problem till now (of course).
For some reason ASA is blocking one IP.
Should I mention that no change to config or internal network is done.
If I bypass ASA and plug-in directly in to ISP router no IP blocking.
This is from log (when I tried to use FTP):
7 Nov 04 2009 12:18:41 609002 Teardown local-host outside: duration 0:00:00

6 Nov 04 2009 12:18:41 302014 Teardown TCP connection 3411 for outside: to inside: duration 0:00:00 bytes 0 TCP Reset-O

6 Nov 04 2009 12:18:41 302013 Built outbound TCP connection 3411 for outside: ( to inside: (

7 Nov 04 2009 12:18:41 609001 Built local-host outside:

I tried to ping, www ... nothing, result is the same, getting "Teardown TCP connection".

Any help would be highly appreciated.


More about : unusual problem asa 5505

September 13, 2010 5:58:27 PM

Hi Websters,

How many devices are connected to the ASA? I have a similar issue where we have 15 devices fighting for the internet.
This may be due to the 10 user licenses which comes standard with the ASA 5505.