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[solved] The VPN client was unable to successfully verify the ip forwarding table modification. A VPN connection will not be established

This articles will walk you on the how to solve the Cisco AnyConnect error message “The VPN client was unable to successfully verify the ip forwarding table modification. A VPN connection will not be established” 

The message is somewhat misleading and most of the time, it points to the internet/cable provider. however there is a easy fix that works all the time.

This is also documented that it is known bug by Cisco

https://quickview.cloudapps.cisco.com/quickview/bug/CSCvf16310

Cisco Bug: CSCvf16310 – IPv6 Addresses intermittently assigned to AnyConnect clients

Products (1) Cisco ASA 5500-X Series Firewalls

Known Affected Releases

9.6(3.1) 9.7(1.2) 9.8(1)

Below is the screenshot of the error message you may get.

 

Here is what you will need to to.

  1.  Go to “start” “run” “cmd” and type the command “ncpa.cpl”

 

2.  This is just  a quick way to get to your network connections screen.

 

3. Right click the connection and choose properties and un-check  the “Internet Protocol Version 6(TCP/IPv6)”

Now right click the Cisco Anyconnect client and choose “Network Repair” and this should fix the problem.

 

 

Try connecting again and this time it will work.

let us know and thanks for reading this.

 

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