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VPN : Error 806

This is very confusing.
one of my client has a laptop on a site they are doing work at.
The laptop is configured to connect to a SBS2011 via PPTP VPN. It has been tested at two other sites and worked ok. But when I try to connect from the first site I get error 806.

I know the RRAS SBS2011 server is working as I can connect from my own site, on my own PC.
I have also tried connecting the laptop to a different RRAS server at a different test site and I get the same error. I also know this other RRAS is working ok.

Here's the weird bit. Another contractor is at the site and is also connecting in his own VPN connection to his own RRAS server, and it works ok.

I'm lost as I don't know where the issue is coming from?
Currently I don't have access to the router on site (but hopefully rectify this tomorrow), and I don't have access to the other contractors laptop.

Any suggestion that I can check would be greatly appreciated.

Thanks and kind regards,
1 Solution
QlemoBatchelor and DeveloperCommented:
Maybe the other contractor uses L2TP/IPsec. Maybe the site router has issues with double NAT and GRE, and it might even be an issue with the combination of routers and/or servers. PPTP is fragile...
VitalNetworkSolutionsAuthor Commented:
Hi Qlemo,

sorry for the late response. The laptop can connect via the VPN for everywhere else, it it's definitely a router setting. I can't get access to the router so I've unfortunately had to give up trying to get a VPN link.

Thanks for your help, you were definitely on the right tracks.

Kind regards,
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