Solved

Receiving EST packet failed authentication error for only one client

Posted on 2008-10-06
2
2,542 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

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Quality settings for cisco routers 8 52
Cisco Firewall setup within a managed office 8 71
cisco switch POE watt limitation 5 57
RDP ISR4321 Cisco Router 7 23
If you use NetMotion Mobility on your PC and plan to upgrade to Windows 10, it may not work unless you take these steps.
Use of TCL script on Cisco devices:  - create file and merge it with running configuration to apply configuration changes
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…
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…

914 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

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now