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Netgear DG834 VPN

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Netgear DG834 VPN

Has anyone successfully set up a working VPN connection using Windows XP VPN Server and a Netgear DG834? I keep getting Error 721, it simply does not authenticate. Help! Cry
19 REPLIES
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Netgear DG834 VPN

What MTU are you using, as I've read somewhere that lowering can sometimes do the trick.

Aaron
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Netgear DG834 VPN

Yes, I read that too somewhere. It was something about the packet header being too large. :shock: My MTU is 1478. Any suggestions as to how much smaller to reduce it to?
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Netgear DG834 VPN

Hmmm, good question really, Try 1450 or 1420 , just remember to adjust your PC and all the settings around it as well.

Aaron
Community Veteran
Posts: 14,469
Registered: 30-07-2007

Netgear DG834 VPN

1458 & 1430 are the more common settings and don't forget to adjust your RWIN to match. See MTU tweak.
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Netgear DG834 VPN

I've tried all sorts of combinations, nothing seems to make a blind bit of difference. Cry I still get Error 721: The remote computer did not respond.
Community Veteran
Posts: 14,469
Registered: 30-07-2007

Netgear DG834 VPN

Are you running any firewalls?

Disable any software firewall and if running XP, disable the windows firewall as well and see if that helps.
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Netgear DG834 VPN

I have already disabled software firewalls, I have opened Port 1723 on my router, according to the logs it forwards the packets to my machine, but the VPN software (courtesy of Microsoft) doesn't respond.
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Netgear DG834 VPN

Ideally, I need to know values of MTU and RWIN which work on somebody else's computer who has got VPN working, so that I can eliminate this possible cause.
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Netgear DG834 VPN

Any Joy? I've not used a VPN but I will be soon for connecting into work. I'll ask a few guys from the computer room in work who setup the laptops to work with VPNs if the have any ideas.

Aaron
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Netgear DG834 VPN

Nope, it's still a complete mystery. The router is forwarding the packets to the correct client, according to the router logs, but the software (MS VPN Server) doesn't respond. Cry
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Netgear DG834 VPN

Could it be a problem at the other end? rather than with your machine?
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Netgear DG834 VPN

Possibly, but I doubt it. I shall ask our tekkies if they block incoming VPN packets.

Nice avatar, by the way, gadgetboy!
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Netgear DG834 VPN

Hi could be their firewall is only set to allow connections on certain ports, or certain IP addys. From what you have said I can't see much more than you can do really.

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Nice avatar, by the way, gadgetboy!
Thanks lol

Aaron
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Netgear DG834 VPN

Well, Netgear have told me that they are sure it is not the router which is at fault. In fact, if I log any outgoing VPN packets, none are logged. So the Microsoft VPN Server software is not responding. Could be an XP SP2 issue!