Tag 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 [...]

Really, Cisco, really ?

I was reading Cisco release notes for their VPN client and spotted this gem: VPN client fails to install on Linux kernel version is 2.6.31 and above. The workaround is to downgrade to one of the Linux distributions supported by the VPN Client. Their supported Linux distros: Red Hat 6.2 with Kernel 2.2.12 (released in [...]

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 http://www.lamnk.com/download/fixes-2.6.38.patch 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 [...]

Cisco VPN Client freezes system with dual core CPU

It’s annoying as hell ! Not only we need to patch to use Cisco client on 64 bit systems, recently i find out Cisco don’t support SMP (multi core) in its VPN client. It means after you load the cisco module, there’s a big chance you will run into a kernel panic: oops, the whole [...]

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 [...]

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 http://tuxx-home.at/projects/cisco-vpnclient/cisco_skbuff_offset.patch patch < cisco_skbuff_offset.patch sudo ./vpn_install That’s it.