VPN Client Changes Resolved Address

Posted on 2014-03-02
Last Modified: 2014-03-12
A few users have reported that their VPN Client changes the pre-configured address from X.X.X.X to For example - from to, Does anyone have any idea why would that hapen?
Question by:Strinalena
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
  • 4
  • 4
LVL 20

Expert Comment

ID: 39898575
Explain a little more.

Do you mean it changes their internet address.
So when they connect up, they get the IP and this then shows up later as ?
Or do you mean it changes addresses they are using - so they go to a web address of that changes ?

If it is there address that changes - is it their real public IP (on their home network) like 192.168.x.x that gets changed or the one they get from your VPN

...or... something totally different ?
LVL 57

Expert Comment

ID: 39899429 is not an IP address, that could be a host name, but IP addresses are numbers.

Author Comment

ID: 39899747

Thanks for the replies. The issue is on the actual VPN client - When the users opens the Cisco Any Connect client - instead of them getting the normal address in the "Connect To" Field, they get So the address of the Firewall to terminate the connection changes for some reason.
Report: Liquid Web beats Amazon, Rackspace & More

A study by performance analyst firm Cloud Spectator finds that Liquid Web beats rivals Amazon, Rackspace and DigitalOcean when it comes to website and cloud application performance.

LVL 57

Expert Comment

ID: 39899787
Still confused.  IP Addresses can not have letters in them.

Is the your public IP address?

If they click on connect, does it work?

Author Comment

ID: 39899941
No - the Public ip is 87.224.XXX.XXX but when the users open the VPN client (You know - when you just double-click it) - instead of it showing the above ip address - it shows of the The user has been able to use the client before but for some reason - at some point it gets changed and the user starts calling the helpdesk as there is no connection via the new strange address in the VPN client. It is not happenning regularly but there have been a few cases. Does this make any sense?
LVL 57

Expert Comment

ID: 39900206
It looks like something is doing a reverse lookup on the IP address of your VPN server and replacing the actual address with the name that is on the PTR record for the address.

It appears that if you have a ASA cluster setup with a specific redirection option, that can happen.


Do you have a ASA cluster?

Do you have the option "redirect-fqdn enable" on your ASA cluster?

Look at the page below and search on "Enabling Redirection"

Author Comment

ID: 39902550
No ASA Cluster. The only comand on the device i find strange is the sysopt norpoxyarp inside. REally strange ans do not think that the issue is with the ASA but looks to me to be with the user's laptops.
So their machines are using their ISP's DNS servers and for some reason, you are saying that they are performing reverse DNS instead of forward one.
LVL 57

Accepted Solution

giltjr earned 500 total points
ID: 39903033
Yes, something is deciding to do a reverse look-up and fill in the server field with the host name that is returned.

It can't do a forward lookup.  Forward look-ups take a name and see what IP address that maps to.  Reverse look-ups take an IP address and find out what name it is mapped to.

Since you know the public IP address, you can issue the command:

     nslookup x.x.x.x

Where x.x.x.x is the  IP address of the VPN server and see what is returned.  You will want to try this from inside your network and from the Internet.  

It's really not that big of a deal.

Author Comment

ID: 39903240
I know - just annoying and it is not even our Firewall :-) Thanks for the replies

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Most of the applications these days are on Cloud. Cloud is ubiquitous with many service providers in the market. Since it has many benefits such as cost reduction, software updates, remote access, disaster recovery and much more.
This article will inform Clients about common and important expectations from the freelancers (Experts) who are looking at your Gig.
Viewers will learn how to properly install and use Secure Shell (SSH) to work on projects or homework remotely. Download Secure Shell: Follow basic installation instructions: Open Secure Shell and use "Quick Connect" to enter credentials includi…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

739 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