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Thanks for the answer. The fact that I spoke in support. I was informed that there were no restrictions in tunneling (TUN / TAP) to no server. Besides, I've tested it myself through the console, everything works.
2 months ago, I set up on this server, OpenVPN, and it worked perfectly. Most recently, he just turned off, and reinstall or to no avail. Installed client here
https://openvpn.net/index.php/access-server/download-openvpn-as-sw/113.html?osfamily=ЦентОС.
My server is not on OpenVZ, everything you need for VPN, there is set. Could you elaborate on "Or in the case of a custom compiled static kernel, go back to the stock kernel." And how all of this check.