General :: Unable To Connect To PPTP VPN With Ubuntu 10.04?

Aug 15, 2010

I'm trying to connect to my corporate VPN using a laptop running Ubuntu 10.04. It's a company laptop but as I have chosen to run Linux rather than "a proper" OS, I'm mostly on-my-own as far as getting these things working. Normally that's OK because I am almost always successful - except this problem has had me stumped for several weeks now.

The problem is that I am unable to access the VPN from my home network. I am using the Gnome Network Manager interface to configure the PPTP connection but no matter what combination of options, domainusername formats, encryption options or authentication methods I select, I get the exact same behaviour, which is essentially a 10-second wait, and then a failure message. I checked /var/log/daemon.log:

Aug 15 22:27:46 pc770-ubu NetworkManager: <info> Starting VPN service 'org.freedesktop.NetworkManager.pptp'...
Aug 15 22:27:46 pc770-ubu NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.pptp' started

[Code]...

the laptop is connecting to the Internet via a WiFi access point (bridge mode), then an ADSL router. PPTP pass-through is enabled on the ADSL router and Access Point. if I connect the laptop to the ADSL with an ethernet cable (to eliminate the WiFi), there is no improvement. another laptop (running Mac OSX) is able to connect to the VPN, via WiFi or cable. another client, Windows7, is able to connect to the VPN via cable. an iPhone is able to connect to the VPN via WiFi. this laptop is able to connect to the VPN from inside the corporate firewall.

So I've got three other devices that are able to connect to the target PPTP VPN, and a laptop that can't, except when I move the laptop inside the target network, it can connect. I've tried methodically selecting various VPN options with no change in result. I've also read several Ubuntu Forum posts suggesting turning off EAP and that doesn't help either. I'm now at a loss how to fix this, and what will happen next is I'll be told by Management "we told you so", drop Linux and switch to a "proper" OS like Windows instead, which I really don't want to do.

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P.S Here are the instructions for Windows XP which work: http://portal.bnet.hr/ZG/windows-xp.htm

Here's what I have done so far code...

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Code:
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[code]....

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I'm trying to connect to a Microsoft ISA PPTP server from my Linux box. The box I'm connecting from is itself a router. I have no problem connecting a Windows XP machine to the VPN via this machine. This is fine, but I would rather connect via the Linux machine, giving me far more advanced routing options (i.e. no to send every packet from the XP box completely unnecessarily via the PPTP tunnel). The Linux router is running Debian Lenny.

I've checked iptables. There were initially some issues. I've fixed those.

Invoking pppd from the console, I can see that authentication succeeds, but then some negotiation goes wrong and the server terminates the connection. Here's the output from pppd, with the more sensitive stuff removed:

Code:
<hostname>:~# pppd call <peer> nodetach debug
using channel 19
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I have installed and setup 3G which works perfectly fine. I use sakis3g scripts for connecting to 3G network. My VPN profile created with network manager (client/NetworkManager GUI) works well.

#cnetworkmanager --activate-connection=user,'XXXXX_vpn_singapore',wlan0,&

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[Code]...

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General :: How To Connect PPTP VPN In Centos

Mar 9, 2011

I need to configure Point to point tunnel protocol (PPTP) vpn in centos.

In Windows XP:

We can able to configure PPTP Vpn like this.

" 1. Open the Windows Control Panel.

2. Open the Network Connections item in Control Panel. A list of existing dial-up and LAN connections will appear.

3. Choose the 'Create a new connection' item from the left-hand side of the window. The Windows XP New Connection Wizard will appear on the screen.

4. First click Next to begin the wizard, then choose the 'Connect to the network at my workplace' item from the list and click Next.

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6. Enter a name for the new VPN connection in the 'Company Name' field and click Next. The name chosen need not match the name of an actual business.

7. Choose an option on the 'Public Network' screen and click Next. The default option, 'Automatically dial this initial connection' can be used if the VPN connection will always be initiated when the computer is not already connected to the Internet. Otherwise, choose the 'Do not dial the initial connection' option. This option requires that the public Internet connection be established first, before this new VPN connection will be initiated.

8. Enter the name or IP address of the VPN remote access server to connect to, and click Next. Company network administrators will provide this information.

9. Choose an option on the "Connection Availability" screen and click Next. The default option, 'My Use Only,' ensures that Windows will make this new connection available only to the currently logged on user. Otherwise, choose the 'Anyone's use' option.

10. Click Finish to complete the wizard. The new VPN connection information has been saved."

But in Centos how we can able to configure PPTP VPN for this we need to install any package. I got all the vpn access credentials from my office to work from home, but i cant able to join in my office network. because of this prob.

iam using : CentOS release 5.4 (Final) versing os

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[Code]....

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Jan 18 18:51:43 david-desktop NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.pptp' started (org.freedesktop.NetworkManager.pptp), PID 5532
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[Code]...

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This is what I'm getting in /var/log/messages code...

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Quote:

May 8 16:37:05 li99-23 pppd[2113]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so is for pppd version 2.4.3, this is 2.4.4
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[Code].....

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[Code]....

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Dec 30, 2010

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Code:

CTRL: I wrote 32 bytes to the client.
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[code]....

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