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Can establish a VPN connection. (using Vista Ultimate)

I previously was able to create a VPN connection using PPTP.

But as of yesterday, for some unknown reason, I started having intermittent problems.  As of today, I can not create my VPN connection.  Again,  I previously had no problem.

I am working on a Windows Vista Ultimate.
I recently got a new Linksys Router.  But this was about a week ago.  The problem only started yesterday.

I don't know what to change or how to change things to test this.

I'm getting an 806 error code that appears when I try to VPN.  "The VPN connection between your computer and the VPN Server could not be established. The most common cause for this failure is that at least one internet device (for example, a firewall or a router) between your computer and the VPN server is not configured to allow Generic Routing Encapsulation (GRE) protocol packets.

Again, I'm using Windows built in VPN (PPTP) connection.  No other application.

Can someone help me identify what the issue is so I can correct it?

Thanks,
Gary

PS: It says "Windows did not find any problem with this computer's network connection (when I click on diagnose).
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njcuwebsupport
Asked:
njcuwebsupport
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1 Solution
 
njcuwebsupportAuthor Commented:
Additional Note:  The Linksys Router I am using is  Simultaneous Dual-Band Wireless-N Router  (Model  WRT400N)
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QlemoC++ DeveloperCommented:
Did you configure PPTP-passthru accordingly? With forwarding to the PPTP server in Linksys Router?
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njcuwebsupportAuthor Commented:
I don't know.

As I said the odd thing is that it goes through sometimes, but not others?

If  you could tell me what settings might be causing the problem, I'll try making the changes.

Thanks,
Gary
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QlemoC++ DeveloperCommented:
In Linksys, there should be a setting called PPTP Passthru or VPN Passthru. It should ask you for a PPTP or VPN server, which is your server, of course.
If your not asked for a PPTP server (unlikely), you have to create port forwarding for TCP port 1723 (PPTP) and protocol (!) 47 (GRE) to your server.
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njcuwebsupportAuthor Commented:
Qlemo,

1. My Linksys is already set to allow VPN Passthru.  This was and is enabled.

2. Under Applications and Games I see a section for Single Port Forwarding.  They have a drop down list for Application Names.  In the list they have   FTP, Telnet, SMTP, DNS, TFTP, Finger, HTTP, POP3, NNTP, and SNMP.  That's all.  I don't see any TCP or  GRE.

??

Gary

Question:  Do you think since my Linksys is already enabled, that the VPN connection is not a problem on my end and only on their end?  If so, what could their problem be?
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QlemoC++ DeveloperCommented:
You are connection from your site (Windows client behind Linksys) to a remote server? Then PPTP passthru needs only to be enabled, no port forwarding needed.

However, PPTP is such a fragile "protocol" that almost anything can break the ability to connect. Such things as Windows Update or Linksys firmware upgrade, for example.

Only way to debug this is to use Ethernet Packet Sniffing (e.g. with free WireShark) on both sides, with filter on PPTP and GRE traffic. However, this needs thorough knowledge of the expected handshake ...

Your Linksys will not support you in debugging this issue. You can't have a look into session table (needed for the firewall and for NAT), you can't see traffic flowing (at least not with the webbrowser based GUI).

As you "didn't change anything" (something you here all the time as an admin), the bets are on the other side.
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njcuwebsupportAuthor Commented:
Thanks
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