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Today afternoon my default vpn tunnel at linux crashed. I can not reconnect it with my default config. I changed nothing in my debian box. Anyone else got this ? All IPv6 support is disabled at my system. vpn over ssl still working EDIT: OK saw the Push message from server: Wed May 2 17:33:52 2018 PUSH: Received control message: 'PUSH_REPLY,comp-lzo no,redirect-gateway ipv6 def1 bypass-dhcp,dhcp-option DNS 10.17.0.1,dhcp-option DNS6 fde6:7a:7d20:17::1,tun-ipv6,route-gateway 10.17.0.1,topology subnet,ping 10,ping-restart 60,ifconfig-ipv6 fde6:7a:7d20:17::1000/64 fde6:7a:7d20:17::1,ifconfig 10.17.0.2 255.255.0.0,peer-id 0,cipher AES-256-GCM' How can I ignore just the IPv6 part of the server and connect by only IPv4 ? Why you do that without advanced warning ? Wed May 2 16:33:39 2018 GDG6: remote_host_ipv6=n/a Wed May 2 16:33:39 2018 GDG6: NLSMG_ERROR: error -95 Wed May 2 16:33:39 2018 ROUTE6: default_gateway=UNDEF Wed May 2 16:33:39 2018 TUN/TAP device tun1 opened Wed May 2 16:33:39 2018 TUN/TAP TX queue length set to 100 Wed May 2 16:33:39 2018 do_ifconfig, tt->did_ifconfig_ipv6_setup=1 Wed May 2 16:33:39 2018 /sbin/ip link set dev tun1 up mtu 1500 Wed May 2 16:33:39 2018 /sbin/ip addr add dev tun1 10.17.0.2/16 broadcast 10.17.255.255 Wed May 2 16:33:39 2018 /sbin/ip -6 addr add fde6:7a:xxxx:xx::1000/64 dev tun1 RTNETLINK answers: Operation not supported Wed May 2 16:33:39 2018 Linux ip -6 addr add failed: external program exited with error status: 2 Wed May 2 16:33:39 2018 Exiting due to fatal error