Hi Tom, I have no access those machines at this moment. But as far as I can remember, the whole certificate chain is correct and the clocks are synchronized. Thanks, Stefaan -----Original Message----- From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx] Sent: dinsdag 13 december 2005 21:23 To: [ISAserver.org Discussion List] Subject: [isalist] RE: Error 786: The L2TP connection attempt failed because there is no valid machine certificate on your computer for security authentication http://www.ISAserver.org Hi Stefaan, Is the clock correct on the machines that aren't working? Is the CA certificate in the right place? Tom Thomas W Shinder, M.D. Site: www.isaserver.org Blog: http://spaces.msn.com/members/drisa/ Book: http://tinyurl.com/3xqb7 MVP -- ISA Firewalls **Who is John Galt?** > -----Original Message----- > From: Stefaan Pouseele [mailto:stefaan.pouseele@xxxxxxxxx] > Sent: Tuesday, December 13, 2005 2:03 PM > To: [ISAserver.org Discussion List] > Subject: [isalist] Error 786: The L2TP connection attempt failed > because there is no valid machine certificate on your computer for > security authentication > > http://www.ISAserver.org > > Hey guys, > > On two laptops with Windows XP SP2 we get the Error 786: The L2TP > connection attempt failed because there is no valid machine > certificate on your computer for security authentication. > > In the Event Security log we see Event ID's 547: > > IKE security association negotiation failed. > Mode: Key Exchange Mode (Main Mode) > Filter: <snip> > Peer Identity: <snip> > Failure Point: Me > Failure Reason: No private key associated with machine certificate > Extra Status: 0x80092004 0x0 > > We have verified that there is a valid machine certificate in the > computer personal store with an associated private key. A new machine > certificate on the failing box isn't working either. Other machines > are working great. So, something must be screwed up on this particular > boxes. > > Any idea how to solve that problem? > > Thanks, > Stefaan > >