Category Archives: VPN

32bit Cisco VPN client on 64 bit linux systems

I’ve just encountered a strange problem with Cisco VPN Client: # ll /opt/cisco-vpnclient/bin/ total 4224 —x–x–x 1 root bin 1241184 Feb 23 12:35 cisco_cert_mgr* —s–x–x 1 root bin 2181976 Feb 23 12:35 cvpnd* —x–x–x 1 root bin 226700 Feb 23 12:35 ipseclog* —x–x–x 1 root bin 666260 Feb 23 12:35 vpnclient* # /opt/cisco-vpnclient/bin/vpnclient zsh: no [...]

How to install Cisco VPN client on Ubuntu Jaunty Jackalope and Karmic Koala 64 bit

Update 2011-05-09: There is a new patch that works (I still recommend the vpnc client instead of Cisco client). I’ve mirrored the patch to my server: fixes-2.6.38.patch. Please note that you should apply the patch against a vanilla vpnclient setup directory (no other patch applied). cd vpnclient/setup/directory/ wget patch < ./fixes-2.6.38.patch sudo ./vpn_install Again, [...]

How to fix error 27848 / 2738 at Cisco VPN installation

Sometimes (even with new machines) there are problems at the client’s installation, for example: Error 27848: Deterministic Network Enhancer installation requires a reboot first, to free locked resources. After that the installation process is rewinded back and canceled. To fix it, open the command prompt as administrator (Right click on cmd then choose Run as [...]

How to install Cisco VPN client on Ubuntu Hardy Heron 8.04 64 bit

Nov 20 2010: New guide for Cisco vpnclient on Ubuntu linux Maverick Meerkat 10.10 UPDATE: A new client for linux ( is out. You no longer need the patch for 2.6.24+ kernel (vpnclient-linux-2.6.24-final.diff). However the patch for 64 bit systems is still required and the CFLAGS variable in Makefile still need to be changed to [...]

Error 56: The Cisco Systems, Inc. VPN Service has not been started

On some systems there is this problem with Cisco VPN service: cvpnd.exe must be excuted before you run the ipsecdialer.exe ( the GUI for the client ). But even if you start the service per hand in services.msc, it got killed in a few seconds after thus you can not run the client. Update: thanks [...]

With kernel 2.6.24 you will need a patch to install Cisco VPN Client

UPDATE: A new client for linux ( is out. You no longer need the patch for 2.6.24+ kernel on 32 bit systems. However a patch for 64 bit systems is still required. Please click on the link right below to see the howto for 64bit. UPDATE: 64 bit systems are a bit more complicated, please [...]

Strange error when compile vpnc

I was playing around with Arch linux recently. It’s a minimalistic distro which lets you configure your system the way you want. Advatanges are booting time ( man it’s fast ), rolling release system so it doesn’t require you to install new release every 6 months like other distros, good package management tool alongside with [...]

Never ending headache … disconnect problem again

The VPN connection on Vista drops after every 5-10 minutes idle times ( means no surfing or other net related activities ). Why ? Fuck me if i know. It doesn’t matter over wireless or LAN, wired connection breaks all the time too. And the employees in uni are reporting disconnecting problem on XP with [...]

Cisco VPN now runs on linux 64 bit systems

Errm … with a patch. Cisco hasn’t released a new version for Linux yet. Quick guide: ( I assume you knew all the requirements to install the Cisco client ) Go to the extracted vpn directory wget patch < cisco_skbuff_offset.patch sudo ./vpn_install That’s it.

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 [...]