Re: VPN drops

Hello Adrian,

Thank you for kind update.

How about my suggestions? If anything is unclear, please do not hesitate to
let me know and I will be happy to help. :)

To bypass the hardware issue, we can try to set up several VPN connections
from internal clients at same time and then monitoring. Are they working
fine?

If they are working fine, that means the VPN connection drop related to
hardware (DSL router) limitation. Please contact your router vendor for
further help.

If the VPN connections still dropped, that means there is configuration
issue on SBS. Please perform the steps in my pervious reply and let me know
the result.

As you mentioned "I would be interested though in finding out which DSL
routers do support multi-pass, are there any lists?" we do not have any
3rd-pary hardware list, I suggest you to contact your hardware vendor to
confirm it.

I look forward to hearing from you.

Thanks and have a nice day!

Best regards,

Terence Liu(MSFT)

Microsoft CSS Online Newsgroup Support

Get Secure! - www.microsoft.com/security

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--------------------
| Message-ID: <46066C94.9040003@xxxxxxxxxxxxxxxxxxxxxxx>
| Date: Sun, 25 Mar 2007 13:35:32 +0100
| From: "Adrian Marsh (NNTP)" <adrian.marsh@xxxxxxxxxxxxxxxxxxxxxxx>
| User-Agent: Thunderbird 1.5.0.10 (Windows/20070221)
| MIME-Version: 1.0
| Subject: Re: VPN drops
| References: <4602EA84.4010309@xxxxxxxxxxxxxxxxxxxxxxx>
<1174642573.571071.146430@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
<uFVDDUTbHHA.3272@xxxxxxxxxxxxxxxxxxxx>
| In-Reply-To: <uFVDDUTbHHA.3272@xxxxxxxxxxxxxxxxxxxx>
| Content-Type: text/plain; charset=ISO-8859-1
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| X-Antivirus: avast! (VPS 000727-1, 23/03/2007), Outbound message
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| Newsgroups: microsoft.public.windows.server.sbs
| NNTP-Posting-Host: 213-162-121-253.adrian080.adsl.metronet.co.uk
213.162.121.253
| Lines: 1
| Path: TK2MSFTNGHUB02.phx.gbl!TK2MSFTNGP01.phx.gbl!TK2MSFTNGP02.phx.gbl
| Xref: TK2MSFTNGHUB02.phx.gbl microsoft.public.windows.server.sbs:25307
| X-Tomcat-NG: microsoft.public.windows.server.sbs
|
| Hmm...
|
| After a bit more research, I'm wondering whether or not the Draytek does
| support multi-pass.. It certainly does allow the tunnels to be created
| and data to pass, but I wonder if it gets confused..
|
| Anyway, I've now figured out how to lock the ethernet ports down to MAC
| specific laptops, so I'm going to setup a LAN-LAN connection instead.
|
| I would be interested though in finding out which DSL routers do support
| multi-pass, are there any lists?
|
| I found a "termination cause" column in the SBS logs, that suggests the
| SBS server thinks the far end disconnected, so I dont think I'll see
| much more..
|
| A.
|
| Adrian Marsh (NNTP) wrote:
| > Its a Draytek 2800 on both ends, but I use VPN on the SBS2003 R1 server
| > as we reached the VPN limits of the Draytek.
| >
| > The Draytek does support multi-vpn client passthrough, and thats fine
| > (I've seen 3 users online at the same time from the same site). Whats
| > odd is why they keep getting kicked off.
| >
| > I was hoping that theres some extra logging in the SBS server that I can
| > turn on to find out why this is... and most importantly, does the SBS
| > server think its a graceful disconnect, or that the users just
| > "disappear"..
| >
| > ndohyycsqotchk@xxxxxxxxxxxxxx wrote:
| >> On Mar 23, 8:43 am, "Adrian Marsh (NNTP)"
| >> <adrian.marsh@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
| >>> Hi All,
| >>>
| >>> I've several XP users at a remote site, who VPN (PPTP) to the SBS
| >>> server.
| >>>
| >>> Generally, I'm happy with the VPN features of the SBS2003 R1 server
| >>> (though I'd still like to get IPSEC with UDP-encapsulation working
| >>> instead of PPTP).
| >>>
| >>> However these remote users are complaining that their PPTP tunnels
keep
| >>> dropping.
| >>>
| >>> I can't do site-site VPN as its not a completely secured location.
| >>>
| >>> But I do need to diagnose more about why the PPTP sessions are
dropping.
| >>>
| >>> What are my options for diagnosing this more (either from the servers
| >>> view, and/or the XP client itself??)
| >>>
| >>> I use IAS log viewer to interpret the current VPN server logs, and all
| >>> that shows is that the user connected ok (not why they disconnected).
| >>>
| >>> I'm monitoring simple ICMP pings to their DSL router, which shows that
| >>> the internet connection stays alive, and our ISP tells me that they
see
| >>> constant days of uptime, so I've ruled out internet connectivity as an
| >>> issue.
| >>>
| >>> Looking at the IAS logs, I see that connection times vary from <1min
to
| >>> <1 hour..
| >>>
| >>> Thanks,
| >>>
| >>> Adrian
| >>
| >> What make/model of router do you have? Some routers don't support
| >> multiple concurrent PPTP VPN sessions to the same host.
| >>
|

.

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