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I have rented a Virtual Private Server and I have set up a VPN (of type PPTP) following this simple tutorial.

It seems that the VPN server is set up correctly, and the VPS administrators told me that everything is correct in their side, and other customers have set up VPNs without problem...

But I can't connect to the VPN from my Windows 7 PC. I get an error: 800: Unable to establish the VPN connection. The VPN server may be unreachable, or security parameters may not be configured properly for this connection.

It seems that my ISP (Sky UK) is blocking the connection or something like that, although I have adde a firewall exception on port 1723 in my router... In fact I asked my ISP and they say they do not support VPN and can´t provide any help with that...

Is there any way to avoid such blocking, if any?

If it's useful, I have run Ms PortQuery on my PC with: portquery -n my.vpn.ip.address -p tcp -o 1723 and the result is the port is FILTERED.

Also, if I check my ports with YouGetSignal online port checker, it says the port 1723 is closed on my IP...

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