• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 1407
  • Last Modified:

TCP packets passes from Access List but drops due to TCP reset

HI Team,

I have a challenging Issue here, We have a source trying to connect to the Server in the inside network.
Source: ( WYSE TERMINAL), Destination :

As source has problem in connecting to the server, i ran the Firewall debugs and collected the following debugs, the same source conencts to another server on the same network fine, and that pretty much rules out the issue with the Firewall Blocking the connection over all, But i want to get tehse following debug meesageges deciphered so that i can get an indication whether it is caused by the Server inside the network and not the Firewall.

Syslog ID:                                                               Message
302013       Built inbound TCP connection for Outside: ( to inside: /1494 (

30214        Teardown TCP connection for Outside: ( to inside: /1494 ( 0:00:00 bytes 3058 TCP Reset-I

106015     Deny TCP (no connection) from to flags FIN ACK on interface outside

an Urgent help will be greatly appriciated

Thanks Team,    
1 Solution
Since I was unfamiliar with this log entry I did some digging and found this link that explains the logs entries quite extensively (credit where credit is due):

I would say that the problem is, as you expected, not on the firewall, but on the server. It seems to not respond to or deny the request. In the logs you see the(embryonic) connection being terminated.

Hope this helps.


tariqmansoorAuthor Commented:
Thanks Team,

Attached Link was quite Helpful for getting more insight to Firewall Handiling of Packtet and generating related Logs

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Will You Be GDPR Compliant by 5/28/2018?

GDPR? That's a regulation for the European Union. But, if you collect data from customers or employees within the EU, then you need to know about GDPR and make sure your organization is compliant by May 2018. Check out our preparation checklist to make sure you're on track today!

Tackle projects and never again get stuck behind a technical roadblock.
Join Now