VPN connection through Virtual PC problem

May 19, 2010 at 08:14:27
Specs: Windows XP
Here's how it goes...Yesterday I purchased a VPN connection(you know, for stealth browsing blah blah...).I managed to connect to Internet(with my new Turkish IP).Then I decided to create a Virtual PC and connect to the VPN through it.That's where the problem came out.When trying to connect I get stuck to the 'Verifying username and password...' message and after that I get a 721 error.I searched a lot and found out something about GRE Protocol(or IP 47 not sure) which in my case is probably disabled.The problem is I cant find anywhere how to enable it.Can I do it through Windows or router?(I have a NetFaster IAD).Thanks...

See More: VPN connection through Virtual PC problem

Report •


#1
May 19, 2010 at 08:29:13
It's necessary to configure this in your router.
It's often called PPTP Pass-Through and must be enabled for that.

GRE (Generic Routing Encapsulation) is a protocol. The protocol number is 47, just as TCP is protocol number 6, UDP is number 17 a.s.o.

It is used to encapsulate other protocols and to transmit the traffic through a "tunnel".

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


Report •

#2
May 19, 2010 at 08:30:49
How will I configure that in my router?
The VPN connection works just fine from my windows XP but it has this error in the Virtual PC.
How is this possible?
They both use the same router. O_o

Report •

#3
May 19, 2010 at 08:36:57
Ah ok, so that it works for your XP machine, the routers configuration seems to be ok.

In that case, you have to take a look at the virtual machine.
Is there any kind of firewall running?

What kind of software are you using for virtualization (VMware, Microsoft Virtual PC or ...)?
How is the network part for that virtualization software configured?

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


Report •

Related Solutions

#4
May 19, 2010 at 08:42:01
The software I use is Sun VirtualBox
I tried all settings in the network part(Bridged, NAT) but didn't work.
Once, using the Bridged option, I first connected to VPN from my physical machine and then turned on the VPC.Then I got an "There was an IP conflict..." error in the virtual Machine.
Should I try with different Virtual PC software?
By the way, in the VPC I have installed Windows XP too.
Should I try with different OS?(Ubuntu or Mac OS X)


Edit : Forgot about the Firewall.I have it disabled in the VPC


Report •

#5
May 19, 2010 at 09:23:56
First of all I would suggest to check the IP address setting in the VM.
If your host machine has e.g. 192.168.1.50, and the VM is running in bridged mode, you can configure the VM to use e.g. 192.168.1.51 and give it a try.

If this won't work, you might use it in VM with WinXP.

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


Report •

#6
May 19, 2010 at 09:29:35
The problem is I don't know how to do that :P

Report •

#7
May 19, 2010 at 09:37:45
Well, I think problem solved.

From the Sun VirtualBox Manual :

"Protocols such as GRE are unsupported: Protocols other than TCP and UDP are
not supported. This means some VPN products (e.g. PPTP from Microsoft) cannot
be used. There are other VPN products which use simply TCP and UDP."

What do you think ?


Report •

#8
May 19, 2010 at 09:53:23
Yes, seems that VirtualBox doesn't support GRE.
So VMware does support it, but I don't now, whether you have VMware.
VMware is also available for Windows and Linux.

There is surely other virtualization software, that do support GRE forwaring correctly.
You may have to google for it and do your own researches, now, that you know, what you're looking for.

Btw: You need this VPN, to authenticate at your ISP?

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


Report •

#9
May 19, 2010 at 10:38:20
Thanks, I am already downloading VMware.
Yes, that's why I need the VPN

Report •

#10
May 19, 2010 at 14:55:44
Nope.

Downloaded VMware and installed windows xp

STILL same problem..........


Report •

#11
May 19, 2010 at 15:56:31
Is the VPN at your ISP bound to a specific MAC address?
Any firewall, maybe from the host system, that blocks the traffic for the VM?

You may open a console screen and check this at the host system with:
tail -f /var/log/firewall

Then try to authenticate from the guest system.

The original poster should always write the last response !!!
Let us know, if the problem is solved !!!


Report •

#12
May 20, 2010 at 00:15:16
Well, I think I got it to work..
Here's what I did.
I connected to the VPN from my physical machine.
Then, I switched on the Virtual PC(I previously set it to NAT) and opened Internet Explorer.Then I found out that my IP is Turkish!
I don't have to connect again from my VPC to the VPN.

Report •


Ask Question