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I had install the openconnect plugin, and configure it well, when connect vpn, it displayed successful, but actually, I cannot get the vpn network IP address, and ping the vpn network IP failed. what is this issue and how to fix it?

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Did you upgrade to Ubuntu 12.10 recently? I did that and my openconnect VPN stopped working after that. Turns out, I had never bothered to configure the firewall to allow VPN connections in the first place. I had kept it off for so long, I had forgotten that it was turned off. After the upgrade, it was turned on by default, blocking my VPN connections. After turning it off again (command line ufw or using Firestarter GUI), my VPN started working normally again... Hope that helps.

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