PPTP VPN and GRE on VPS with Openvz

Sometimes PPTPd would work and sometimes won’t. When you see in the logs: GRE: xmit failed from decaps_hdlc: Operation not permitted CTRL: PTY read or GRE write failed (pty,gre)=(6,7) We tell iptables to open the INPUT chain of the filter for the GRE protocol. iptables -t filter -A INPUT -p gre -j ACCEPT...

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