Re: VPN Error 720

I think the Zywall is not configured for VPN passthrough.

http://support.microsoft.com/kb/314869/
(Which, BTW, I found by plugging 'vpn error 720' into google)

You have to _understand_ PPTP VPN. The calling endpoint (in deliberate
avoidance of client/server terminology) makes a TCP (IP protocol 6) call to
TCP Port 1723 on the other endpoint. This TCP connection is only used to
establish the GRE (IP protocol 47) tunnel. CAREFUL, those (6 & 47) are IP
_protocol_ numbers, not TCP port numbers (1723 is a TCP port).

or you have to understnad IPSec, which is only a little more complicated.
I'm guessing though that IPSec ain't gonna work through the zywall so we're
stuck with PPTP.

<svesjo> wrote in message news:f7ged4p4h4ql8pskmppc37qj7mkns9ou5i@xxxxxxxxxx
I have set up a Small Business Server 2003, and tried to set up a vpn
to access the server from a remote computer via adsl.
It does not work. I get error 720 every time.

In the system log on the server I get the following message:
The user AB\Nils connected to port VPN4-4 has been disconnected
because no network protocols were successfully negotiated.

How can I troubleshoot this?

The server is behind a Zywall 2 firewall. But I think the firewall
must be configured correctly because I get the error message on the
server.

Svesjo


.

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