Cisco VPN Failed to establish a VPN connection., port 29747

Installation, configuration and troubleshooting of the Cisco VPN Client on Linux systems

Cisco VPN Failed to establish a VPN connection., port 29747

Postby artsol » Fri Jan 22, 2010 5:05 pm

Hi, guys,

Does anybody know or solved the next issue:
vpnclient connect ts nocertpwd
Cisco Systems VPN Client Version 4.8.01 (0640)
Copyright (C) 1998-2007 Cisco Systems, Inc. All Rights Reserved.
Client Type(s): Linux
Running on: Linux 2.6.24-26-generic #1 SMP Tue Dec 1 18:37:31 UTC 2009 i686
Config file directory: /etc/opt/cisco-vpnclient

Initializing the VPN connection.
Secure VPN Connection terminated locally by the Client
Reason: Failed to establish a VPN connection.
There are no new notification messages at this time.

system: ubuntu 8.04 32bit
vpnclient-linux-x86_64-4.8.02.0030-k9

On windows cisco vpn client ver. 5.0.04.0300 connects successfully to gw, but it uses port 4500 (udp) from the first
packet. On linux vpnclient-linux-x86_64-4.8.02.0030-k9 sends one packet to 29747 (udp) and nothing else (gw does not respond to this packet, as I understand, port 29747 is not used on gw)

Thank you in advance.
artsol
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Re: Cisco VPN Failed to establish a VPN connection., port 29747

Postby lbt » Sun Mar 14, 2010 7:58 pm

I had exactly this problem... stumped me for hours...

My topology is :
Host -> Linux firewall/ADSL -> ISP
and the single packet wasn't getting to the firewall.

I *think* the 'fix' for me was to apply
override-local-lan-access.diff
from http://projects.tuxx-home.at/ciscovpn/patches
lbt
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Re: Cisco VPN Failed to establish a VPN connection., port 29747

Postby ef » Wed May 26, 2010 12:35 am

Anyone able to figure this one out? It's got me stuck, too.

My .pcf is set up to connect to TCP port 10000:

TunnelingMode=1
TcpTunnelingPort=10000

and the vpnclient prints a message which indicates it understands that:

Initializing the VPN connection.
Initiating TCP to 50.192.191.77, port 10000

but when I run tcpdump, I see that it is really sending packets to UDP port 29747:

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on wlan0, link-type EN10MB (Ethernet), capture size 96 bytes
18:30:21.575244 IP 192.168.1.28.34328 > 50.192.191.77.29747: UDP, length 16

I'm not sure where the 29747 is coming from; it doesn't appear anywhere in the vpnclient sources that I built from. My guess is that it's a default within the kernel module that is being used for some reason instead of the real port number requested by the vpnclient.

This used to work for me with a (nearly?) identical .pcf file with the older 2.6.25 kernel, but now that I'm running 2.6.32 it won't play nice any more and I am running into this problem.

Any help would be appreciated.
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Re: Cisco VPN Failed to establish a VPN connection., port 29

Postby ef » Thu Oct 14, 2010 3:31 pm

bump?       :?
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