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I have the following network configuration:

My PC 192.168.1.20/24 uses 192.168.1.1/24 as a gateway. Dlink-2760U router with Local address 192.168.1.1/24 has a VPN connection open with the provider using PPTP.

Whenever I'm trying to open some web-sites that has some authorization (e.g. gmail.com, coursera.org), I'm getting a request timeout. This problem is observed mostly on linux (Ubuntu 12.04 and Debian 6.0), while most of such websites work correctly on windows XP.

Could you please help me diagnose the problem? Could it be related to NAT + HTTPS?

Thanks

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Is it a legitimate VPN provider? Or are you trying to use some free service that possible only works with standard (unencrypted) web traffic? –  David Cowden Jul 2 '12 at 15:20
    
It's a very popular legitimate local ISP. I have a couple of computers at home and I need to have them all access to the internet. Unfortunately, the provider doesn't allow to initiate its clients several VPN connections at the same time. Instead it advices to initiate one on the ADSL modem. –  negai Jul 2 '12 at 15:27
    
Unlikely to be a NAT issue. Much more likely to be a routing issue. When the VPN is active, you will be routing via it. Try doing some trace routes to localish web sites. Also, if you can, try the trace routes without the VPN active. –  Julian Knight Jul 2 '12 at 15:45

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