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Posts: 2 Joined: 28.Feb.2008 Status: offline >> --> I am having a problem establishing a VPN (PPTP) connection from the Internet to my ISA 2006 Standard Edition. Receiving Error 800: Unable to establish VPN connection -- --ISA 2006>-- I have configured VPN pass through on the Cisco router and applied the access-list for inbound and outbound on each interface. access-list 101 permit ip any any access-list 101 permit gre any any access-list 101 permit tcp any any eq 1723 The ISA log logs an initiated PPTP connection on port 1723 from the client with system policy “Allow VPN traffic to ISA server” then there is a denied connection logged. Also, I have tested the connection using PPTP tools. Here are the results. C:\Dloads\ISA\PPTP Tools>pptpclnt xxx.xxx.xxx.xxx Initializing WinSock. Obtaining host information. Successfully resolved server's host information ====================================== Enter data to send to server (between 1 and 255 chrs.), then hit enter: -->1 Successfully connected to server using TCP port 1723 (PPTP) Sending data to server Waiting for a reply to the data which was just sent. Error 10054 calling recv(): WSAECONNRESET: Connection reset by peer Creating a socket to test GRE protocol traffic. Total GRE packets sent = 1 Total GRE packets sent = 2 Total GRE packets sent = 3 Total GRE packets sent = 4 Total GRE packets sent = 5 ===================================== Check server to see if the GRE packets were received successfully ===================================== Closing down socket Goodbye!
Posts: 2 Joined: 13.Mar.2008 Status: offline >> --> Yeah, i have disabled this. I did it as part of my reinstall of SP2 and ISA2006. Any other ideas? Is there somewhere else where RSS might be turned off?
Post #: 3 RE: Unable to establish a PPTP VPN connection - 13.Mar.2008 12:54:17 PM samh.
Logged in as: Guest Printable Version All Forums >> [ISA 2006 Firewall] >> VPN >> Unable to establish a PPTP VPN connection Page:  Login Message Newer Topic >> Unable to establish a PPTP VPN connection - 28.Feb.2008 8:14:17 PM Kazi.
Welcome to ISAserver.org.
I am able to successfully establish a VPN from my internal network. I did this just to test and would not usually do this in production.
But again, 1723 is open but clients are not authenticating. I did check the registry key mentioned in the previous post and it is set to zero.
Posts: 2 Joined: 28.Feb.2008 Status: offline >> --> The problem is coming from the RSS (Receive Side Scaling) feature in the Win2003 SP2.
RE: Unable to establish a PPTP VPN connection - 13.Mar.2008 8:41:36 AM samh.
Similar to the original poster, I see the exact same results when running pptpsrv (from ISA box) and pptpclt (from my home).
Is it related to Routing and remote access?
Posts: 10 Joined: 8.Jan.2007 Status: offline >> --> I was researching this issue today and came across this post. I am having the exact same issue. My firewall team is adamant that GRE (type 47) has been given access from the outside world to the ISA server.
To disable it, go into the registry : HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters and set the key "EnableRSS" to 0.
I had to disable this feature to allow incoming PPTP session. A reboot is required.
Any help would be greatly appreciated!
Post #: 2 RE: Unable to establish a PPTP VPN connection - 13.Mar.2008 12:29:19 PM Kazi.
Thanks for your quick reply.
Post #: 4 RE: Unable to establish a PPTP VPN connection - 29.Apr.2008 2:45:06 PM mikepiet.
The machine is an ISA 2006 box running on Server 2003 SP2. The ISA box is joined to the domain.
Posts: 2 Joined: 13.Mar.2008 Status: offline >> --> This is exactly the same error we are experiencing. It only occured after after reinstalling Service Pack 2, and then reinstalling ISA 2006, using a copy of our saved firewall policy config.