L2TP Error 791 Connecting From Outside

L2TP Error 791 Connecting From Outside

Post by paul » Fri, 03 Oct 2003 02:29:20

We're trying to use L2TP/IPSec to get remote access for our users
(it's more compatible with firewalls than PPTP seems to be), and are
running to a bit of trouble connecting.

Our setup:

Win2003 server with RRAS configured to listen for L2TP connections
(using SharedKey instead of certificates).

WinXP clients with L2TP and the secret configured in their VPN

Firewall is a Linksys forwarding ports 500, 1701, 4500 (both TCP+UDP)

The VPN connection works fine when the client is on the lan, but when
it's outside the firewall I get "Error 791: The L2TP connection
attempt failed because security policy for the connection was not

From the logs, I can see that the IPSec tunnel is being created fine
(the IKE works, etc.)

Anyone out there seen this before? (or have an idea which security
policy is missing?)

Thanks greatly in advance.


1. L2TP/IPSec VPN: Error 791

2. l2tp ipsec error 791

i ve installed a windows 2000 server (there's only one network card).
I ve done : l2tp with pre-shared key (security ip)
i ve opened on the router : udp 4500 ; udp 500 and udp 1701
when i try to connect with a lan client (xp pro sp2), it works good !

But at home XP SP2, i ve the following error (791): The L2TP connection
attempt failed because security policy for the connection was not found.
i ve put this key in my regedit : AssumeUDPEncapsulationContextOnSendRule (2)
reboot , i ve got the same error 791

Help me please.

3. error 791

4. Error:791 Security Policy not found

5. IPSec Error 791

6. Antivirus Free Download 791

7. TidBITS#791/08-Aug-05 posted to c.s.m.digest

8. vga=791 (was boot/kernel debian probleem)

9. TidBITS#791/08-Aug-05 posted to c.s.m.digest

10. Stream Identifier Option in RFC 791

11. [2.6.1] fbdev console: can't load vga=791 and yes vga=ask!

12. [Bug #10632] [2.6.26-rc1] Output to console stops when booted without 'vga=791'

13. VPN L2TP [Error 786: The L2TP connection failed bec...]

14. help:blue-screen error when connecting vpn whit l2tp protocol

15. error connecting to OWA from outside organisation