Re: VPN Connection - Can't establish connection!

Tech Tip: Click here to run a free scan for Windows Errors and optimize PC performance

From: Marina Roos [SBS-MVP] (marina_at_roos.nodontwantspam.nl.com)
Date: 12/03/04


Date: Fri, 3 Dec 2004 22:19:06 +0100

Hi Colin,

Port 500 is only needed if you are using the IPSec and it needs to be TCP,
not UDP. And that is only needed when you are using VPN with L2TP/IPSec
which needs port 1701.

-- 
Regards,
Marina
Microsoft SBS-MVP
"Colin C" <nospam.colin@nojunk.co.uk> schreef in bericht
news:eSLLjYX2EHA.1192@tk2msftngp13.phx.gbl...
> Just a thought but We have also UDP port 500 open for VPN, we are using
> an SMC router/firewall to a SBS2003 machine with single NIC
>
> Hope it helps
>
> Colin C
>
> Marina Roos [SBS-MVP] wrote:
> > Hi,
> >
> > Check for firmware upgrades or sometimes even downgrades that will
enable
> > the Gre 47.
> >


Relevant Pages

  • Re: Block UDP Ports?
    ... I'm using Checkpoint Firewall-1. ... reasonable that Firewall-1 would leave UDP wide open. ... > UDP ICMP port unreachable scanning: This scanning method varies from the ...
    (comp.security.firewalls)
  • UDP DoS attack in Win2k via IKE
    ... This memo should clarify the issue discovered with the UDP DOS ... Sending of UDP traffic to port 500 UDP will cause windows to ... attacked host is an IPSec gateway). ...
    (Bugtraq)
  • Re: LDAP UDP Port Problem
    ... The correct fix is to identify that the network gear is tossing out the UDP ... Then I did some portqry's on the LDAP port ... > Sending LDAP query to TCP port 389... ...
    (microsoft.public.windows.server.networking)
  • Re: Block UDP Ports?
    ... UDP scanning is questionable to many - if the port is open, ... closed ports aren't even required to send an error packet. ...
    (comp.security.firewalls)
  • Re: LDAP UDP Port Problem
    ... The correct fix is to identify that the network gear is tossing out the UDP ... Then I did some portqry's on the LDAP port ... > Sending LDAP query to TCP port 389... ...
    (microsoft.public.windows.server.setup)