Solved

Receiving EST packet failed authentication error for only one client

Posted on 2008-10-06
2
2,641 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
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 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

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Concerto Cloud Services, a provider of fully managed private, public and hybrid cloud solutions, announced today it was named to the 20 Coolest Cloud Infrastructure Vendors Of The 2017 Cloud  (http://www.concertocloud.com/about/in-the-news/2017/02/0…
For months I had no idea how to 'discover' the IP address of the other end of a link (without asking someone who knows), and it drove me batty. Think about it. You can't use Cisco Discovery Protocol (CDP) because it's not implemented on the ASAs.…
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…
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…
Suggested Courses
Course of the Month8 days, 21 hours left to enroll

617 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