Solved

Receiving EST packet failed authentication error for only one client

Posted on 2008-10-06
2
2,557 Views
Last Modified: 2012-08-14
I have an IPSEC VPN set up on an ASA 5520. I have a few clients on it for testing purposes. All clients are working fine, except one that I keep receiving this message for:

IPSEC: Received an ESP packet (SPI= 0xA71AC130, sequence number= 0xB2C57) from (his external IP)(user= XXX) to (our ext. IP) that failed authentication.

I get the error in ~20 second intervals. He is passing traffic and not noticiing any problems, but this error is annoying. Any idea what is going on?
0
Comment
Question by:downscm
  • 2
2 Comments
 
LVL 32

Accepted Solution

by:
harbor235 earned 500 total points
ID: 22659557


Looks like the payload of some of his packets are being changed somewhere between creation and receiving them on your end. ESP encrypts and does integrity checking on the payload or the embeded IP packet only. Could be his NIC is having issues, check for input/output errors on his end or your receiveing end, or on any switch ports in between. The payload has changed somewhere in the path.

harbor235 ;}
0
 
LVL 32

Expert Comment

by:harbor235
ID: 22659573
Sounds like its this client though, because no other clients have this issue(correct), it could be anywhere in his infrastructure from the time it is created to the time it gets routed to you.

harbor235 ;}
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Line cards, Supervisor, Control plane 7 37
Cisco ASA 5505 Login issues 2 38
Port Forwarding on Cisco 881 14 58
Use of vpn-filter value  in S2S VPN 2 35
This article will cover setting up redundant ISPs for outbound connectivity on an ASA 5510 (although the same should work on the 5520s and up as well).  It’s important to note that this covers outbound connectivity only.  The ASA does not have built…
Quality of Service (QoS) options are nearly endless when it comes to networks today. This article is merely one example of how it can be handled in a hub-n-spoke design using a 3-tier configuration.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
As a trusted technology advisor to your customers you are likely getting the daily question of, ‘should I put this in the cloud?’ As customer demands for cloud services increases, companies will see a shift from traditional buying patterns to new…

803 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question