Re: VPN fails over dial-up after 4 minutes

From: Les Connor [SBS MVP] (les.connor_at_DEL.cfive.ca)
Date: 06/14/04 

Date: Sun, 13 Jun 2004 23:00:59 -0500

I could swear I saw reference to a hotfix for a recent security update (last
60 days) that corrected this behaviour with VPN dropping. Think I can find
it ? No. 

-- 
Les Connor [SBS MVP]
-------------------------------------
SBS Rocks !
"Bryan L" <blinton@connellinsurance.nospam.com> wrote in message
news:e8yPDRaUEHA.2844@TK2MSFTNGP12.phx.gbl...
> Thanks for the suggestions, although most of them I haven't had a chance
to
> try yet.  I brought the boss's laptop home with me for the weekend to do
> further testing.  I think I've determined that it's a software issue, but
> haven't yet had time to narrow it down further.  I did a parallel, clean
> install of XP Pro on it, alongside his existing 2k Pro installation.
Before
> applying any critical updates or installing any software, I established a
> VPN connection to the SBS over both broadband and dial-up connections.
Both
> tested fine with continuous pings for an extended period of time without
> problems.  The parallell, existing installation of 2k Pro on the same
laptop
> failed the same test over both broadband and dial-up.
>
> Now all I have to do is apply updates and install applications one at a
time
> on the clean XP Pro install, testing after each change.  Or alternatively,
I
> could throw msconfig.exe on the 2k installation and selectively disable
> startup items to see if that gets me anywhere.  Either way, it's
> time-consuming to be sure, but it's the only way I'll find the problem.  I
> hope to god it isn't our mission-critical agency-management database app.
>
> To answer David's question, we aren't running firewall software...just
> antivirus software.  We'll see if that's involved at all.
>
> I'll post results here.
>
>
>
>
>
> "David Jones [MSFT]" <dajones@online.microsoft.com> wrote in message
> news:OiQ0NZAUEHA.808@tk2msftngp13.phx.gbl...
> > Are there any common networking or firewall/security applications
> installed
> > on all the machines showing this problem?
> > Do any event log errors show up on either the client or the server?
> > Also, try doing an "ipconfig /all" on the server - you should see an
entry
> > called PPP Dial-in adapter.  Try running a continuous ping to that IP
> > address, and see if you get the same behavior.
> >
> > One final test to try - if you put one of these laptops on the local
LAN,
> > and make a manual VPN connection over the internal network, do you see
the
> > same problem with continuous pings and the eventual unresponsive
> connection?
> >
> > David Jones
> > SBS Product Team
> >
> > -- 
> > This posting is provided "AS IS" with no warranties, and confers no
> rights.
> >
> >
> > "Bryan Linton" <blinton@nospam.connellinsurance.com> wrote in message
> > news:%23SPs1QAUEHA.3420@TK2MSFTNGP09.phx.gbl...
> > > We're running SBS 2003 in a domain environment with about 30 users.
We
> > > began testing VPN access to our network over dial-up for our laptop
> users.
> > > Our testing methodology:
> > >
> > > - Boot the laptop while disconnected from the network.
> > > - Log the user into his domain user account using cached credentials.
> > > - Initiate a dial-up connection to the internet.
> > > - Initiate the VPN connection using the shortcut called "Connect to
> Small
> > > Business Server" (placed on the user's desktop by the client
> configuration
> > > wizard)
> > >
> > > So far, all works well.  The VPN connection functions as it should,
but
> > > slowly, of course, since it's dial-up.  But about four minutes into
the
> > > connection, it suddenly becomes unresponsive.  The connection does not
> > drop
> > > (at least, not within the next few minutes; we haven't tested beyond
> > that).
> > > If we disconnect and reestablish the VPN connection -- using either
the
> > same
> > > dial-up connection or a freshly estabished one; it doesn't seem to
make
> a
> > > difference -- we get another four minutes before it stops responding
> > again.
> > > I have varied the connection load from almost none to constant, full
> > > bandwidth usage, with no difference.  If I set a continuous ping to a
> node
> > > on the internal lan, it replies fine up until four minutes is reached
> > (give
> > > or take 5-10 seconds).  Then, the ping suddenly says, "request timed
> out"
> > > (note that it does not say, "destination host unreachable".
> > >
> > > We have tried the same thing from other laptops and desktops within
our
> > > organization using the same testing methodology.  The client OS in all
> > cases
> > > is either 2000 Pro or XP Pro.  We've even wiped a new laptop and done
a
> > > clean, manual install of XP Pro, freshly installed with the
applications
> > we
> > > use, and no extra fluff.  The results are identical.
> > >
> > > Here's the kicker...if I go home and establish a VPN connection over
my
> > > broadband connection, it works fine.  I used it for a couple of hours
> last
> > > night and the connection never went south.  So at this point, I can
only
> > > imagine one of two things: either it occurs only with dial-up
> connections;
> > > or, some common software or service used in our office is contributing
> to
> > > the problem (I don't have any of the agency software installed at
home).
> > I
> > > plan to test further this weekend by using a dial-up connection at
home
> to
> > > connect.
> > >
> > > Incidentally, from home I used the "Connect to Small Business Server"
> > > method, and a manually configured VPN using XPs built-in VPN
> capabilities.
> > > No difference.
> > >
> > > Our network is protected by a SonicWall firewall with 1:1 NAT going to
> our
> > > SBS.
> > >
> > > Any help is appreciated...our NT4 Terminal Server is recently no more,
> and
> > > the owner is NOT happy that our new solution isn't working for him.
> Heh,
> > > and I'm stumped.
> > >
> > > Thanks in advance!
> > >
> > > Bryan
> > >
> > >
> >
> >
>
>

Relevant Pages

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