Cisco VPN Client: Reason 412 – The remote peer is no longer responding


The error: "Secure VPN connection terminated locally by the Client. Reason 412: The remote peer is no longer responding" means the software VPN Client detected that the VPN server is not responding anymore and deleted the connection. This is caused by several different reasons, for example:

  • The user is behind a firewall that is blocking ports UDP 4500/500 and/or ESP.
  • The VPN client is using connecting on TCP and the default TCP port 10000 for NATT is blocked.
  • The internet connection is not stable and some packets are not reaching the VPN concentrator/server or the replies from the server/concentrator aren’t getting to the client, hence the client thinks the server is no longer available.
  • The VPN client is behind a NAT device and the VPN Server doesn’t have NAT-T enabled. In this case the user will not be able to send or receive traffic at all. It will be able to connect but that’s all. After some time the software client deletes the VPN tunnel.

Suggested solutions:

  • If you are using wireless, try to connect with cable
  • Turn your firewall off, then test the connection to see whether the problem still occurs. If it doesn’t then you can turn your firewall back on, add exception rules for port 500, port 4500 and the ESP protocol in your firewall
  • Turn on NAT-T/TCP in your profile ( remember to unblock port 10000 in your firewall)
  • Edit your profile with your editor and change ForceKeepAlive=0 to 1

Related posts:

  • Dfullen

    Take a look at this post that offers an easy way to solve the problem of Cisco 412 Error.

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  • Guest

    Not completely correct… Cisco may well have refused to “CERTIFY” a 64-bit version of the ipsec based VPN client with Microsoft. I wouldn't fault them for that considering the cost and effort involved in doing so.

    Also, if you know anything about Cisco you'll know that all current versions of PIX / ASA support the AnyVPN client with SSL functionality – which is “Certified for Windows”

  • Lamnk

    I don't know what you mean with “certify”. But at my university we requested 64bit version of the ipsec client for many years already, and only until recently released Cisco one that works for Windows Vista and 7. Considering from say2 years ago a lot of recent laptops/computers were already shipped with 4GB RAM, it's quite ignorance of Cisco, at least from my perspective.

    I'm not a Cisco expert but i do know that Cisco ASA line offers SSL VPN with 64bit capable AnyConnect client. However a lot of universities in Germany use old Concentrator 3000 series due to licensing cost. Switching to newer ASA 5500 line requires budget and affects many users (more than 30000 students and employees in Heidelberg). Maybe that's the reason Cisco doesn't want to release a 64bit IPsec client: to force buyers upgrade to SSL VPN so they can sell more devices.

  • Bobbydrake

    thanks! this worked!

  • Tac has been released from beta and is official Cisco support for Windows 7. There is a 32bit and 64bit binary available.

  • Lamnk

    Yes i knew that. After how many years ? I worked as a VPN assistant for 2 years now, since the beginning there were always requests for 64-bit version. All i can said to them was sorry, cisco doesn’t offer 64bit, i can’t help you there.

    Oh, and the linux client always has problem whenever a new kernel is released. People always have to patch this or that file in order to compile Cisco client. It’s simply not maintained.

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