I'm now try to configure ipv6 addr for openconnect. my vps provider assign me /64 block ipv6 address. here is my ocserv.conf #auth = "certificate[optional]" auth = "plain[/etc/ocserv/ocpasswd]" max-clients = 0 max-same-clients= 0 tcp-port = 444 udp-port = 444 keepalive = 32400 dpd = 240 mobile-dpd = 1800 try-mtu-discovery = false server-cert = /etc/ocserv/ssl.pem server-key = /etc/ocserv/key.pem ca-cert =/etc/ocserv/ca.pem tls-priorities = "NORMAL:%SERVER_PRECEDENCE:%COMPAT" auth-timeout = 40 mobile-idle-timeout = deny-roaming = false cookie-timeout = 86400000 rekey-time = 86400000 rekey-method = ssl use-utmp = true use-occtl= true user-profile = /etc/ocserv/profile.xml pid-file = /var/run/ocserv.pid socket-file = /var/run/ocserv-socket run-as-user = nobody run-as-group = nogroup net-priority = 5 device = anyconnectSSL default-domain = www.abc.com ipv4-network = 10.10.10.2 ipv4-netmask = 255.255.255.0 dns = 8.8.8.8 dns = 8.8.4.4 ipv6-network = 2400:8900:e000:00ba:: ipv6-prefix = 64 ipv6-dns = 2400:8900::2 ipv6-dns = 2400:8900::3 ping-leases = false output-buffer = 10 route = 103.0.0.0/255.0.0.0 route = 106.0.0.0/255.0.0.0 route = 107.0.0.0/255.0.0.0 route = 108.0.0.0/255.0.0.0 route = 141.0.0.0/255.0.0.0 route = 153.0.0.0/255.0.0.0 route = 160.0.0.0/255.0.0.0 route = 166.0.0.0/255.0.0.0 route = 17.0.0.0/255.0.0.0 route = 173.0.0.0/255.0.0.0 route = 176.0.0.0/255.0.0.0 route = 178.0.0.0/255.0.0.0 route = 184.0.0.0/255.0.0.0 route = 194.0.0.0/255.0.0.0 route = 198.0.0.0/255.0.0.0 route = 199.0.0.0/255.0.0.0 route = 203.0.0.0/255.0.0.0 route = 204.0.0.0/255.0.0.0 route = 205.0.0.0/255.0.0.0 route = 208.0.0.0/255.0.0.0 route = 209.0.0.0/255.0.0.0 route = 210.0.0.0/255.0.0.0 route = 216.0.0.0/255.0.0.0 route = 3.0.0.0/255.0.0.0 route = 4.0.0.0/255.0.0.0 route = 31.0.0.0/255.0.0.0 route = 46.0.0.0/255.0.0.0 route = 50.0.0.0/255.0.0.0 route = 54.0.0.0/255.0.0.0 route = 61.0.0.0/255.0.0.0 route = 64.0.0.0/255.0.0.0 route = 67.0.0.0/255.0.0.0 route = 68.0.0.0/255.0.0.0 route = 69.0.0.0/255.0.0.0 route = 70.0.0.0/255.0.0.0 route = 72.0.0.0/255.0.0.0 route = 74.0.0.0/255.0.0.0 route = 75.0.0.0/255.0.0.0 route = 76.0.0.0/255.0.0.0 route = 77.0.0.0/255.0.0.0 route = 79.0.0.0/255.0.0.0 route = 8.0.0.0/255.0.0.0 #route = 184.154.128.0/255.255.255.0 route-add-cmd = "ip route add %R dev %D" route-del-cmd = "ip route delete %R dev %D" cisco-client-compat = true custom-header = "X-DTLS-MTU: 1200" custom-header = "X-CSTP-MTU: 1200" the syslog shows errors Dec 3 03:39:34 install ocserv[12493]: main: initialized ocserv 0.8.8 Dec 3 03:39:34 install ocserv[12494]: sec-mod: sec-mod initialized (socket: /var/run/ocserv-socket.12493) Dec 3 03:39:57 install ocserv[12494]: sec-mod: received request from pid 12495 and uid 65534 Dec 3 03:39:57 install ocserv[12494]: sec-mod: cmd [size=40] sm: sign Dec 3 03:39:57 install ocserv[12493]: main: 60.171.229.33:53017 main-misc.c:425: command socket closed Dec 3 03:40:00 install ocserv[12494]: sec-mod: received request from pid 12496 and uid 65534 Dec 3 03:40:00 install ocserv[12494]: sec-mod: cmd [size=26] sm: auth init Dec 3 03:40:00 install ocserv[12494]: sec-mod: auth init for user 'alect' (group: '*') from 'myip' Dec 3 03:40:00 install ocserv[12493]: main: myip:53018 main-misc.c:425: command socket closed Dec 3 03:40:03 install ocserv[12494]: sec-mod: received request from pid 12497 and uid 65534 Dec 3 03:40:03 install ocserv[12494]: sec-mod: cmd [size=27] sm: auth cont Dec 3 03:40:03 install ocserv[12494]: sec-mod: auth cont for user 'alect' Dec 3 03:40:03 install ocserv[12494]: sec-mod: auth deinit for user 'alect' Dec 3 03:40:03 install ocserv[12493]: main: myip:53019 main-misc.c:425: command socket closed Dec 3 03:40:03 install ocserv[12493]: main: myip:53020 main-misc.c:425: command socket closed Dec 3 03:40:03 install ocserv[12493]: main: myip:53021 main-misc.c:425: command socket closed Dec 3 03:40:04 install ocserv[12493]: main: myip:53022 main-misc.c:425: command socket closed Dec 3 03:40:04 install ocserv[12494]: sec-mod: received request from pid 12501 and uid 65534 Dec 3 03:40:04 install ocserv[12494]: sec-mod: cmd [size=40] sm: sign Dec 3 03:40:04 install ocserv[12493]: main: myip:53024 main-misc.c:425: command socket closed Dec 3 03:40:04 install ocserv[12493]: main: myip:53025 main-misc.c:425: command socket closed Dec 3 03:40:05 install ocserv[12493]: main: myip:53026 main-misc.c:425: command socket closed Dec 3 03:40:05 install ocserv[12493]: main: myip:53027 main-misc.c:425: command socket closed Dec 3 03:40:06 install ocserv[12494]: sec-mod: received request from pid 12505 and uid 65534 Dec 3 03:40:06 install ocserv[12494]: sec-mod: cmd [size=261] sm: decrypt Dec 3 03:40:06 install ocserv[12493]: main[alect]: myip:53029 assigned IPv4 to 'alect': 10.10.10.1 Dec 3 03:40:06 install ocserv[12493]: main[alect]: myip:53029 assigned IPv6 to 'alect': 2001:19f0:7000:8c01:0:ab:8da9:1 Dec 3 03:40:06 install ocserv[12493]: main[alect]: myip:53029 assigning tun device anyconnectSSL0 Dec 3 03:40:06 install ocserv[12493]: main[alect]: myip:53029 user 'alect' of group '*' authenticated (using cookie) Dec 3 03:40:06 install ocserv[12493]: main[alect]: myip:53029 main-misc.c:425: command socket closed Dec 3 03:40:06 install ocserv[12519]: GnuTLS error (at worker-vpn.c:749): Error in the pull function. Dec 3 03:40:06 install ocserv[12493]: main: myip:53030 main-misc.c:425: command socket closed Dec 3 03:40:07 install ocserv[12493]: main: myip:53031 main-misc.c:425: command socket closed Dec 3 03:40:14 install ocserv[12494]: sec-mod: received request from pid 12521 and uid 65534 Dec 3 03:40:14 install ocserv[12494]: sec-mod: cmd [size=40] sm: sign Dec 3 03:40:15 install ocserv[12493]: main: myip:53032 main-misc.c:425: command socket closed someone can help me with this?