With a GUI rule for TCP port 113 in ipv6 firewall, no origin/dest ip. admin@acedia:/tmp/home/root# ip6tables -L Chain INPUT (policy DROP) target prot opt source destination ACCEPT all anywhere anywhere state RELATED,ESTABLISHED DROP all anywhere anywhere state INVALID ACCEPT all anywhere anywhere state NEW ACCEPT all anywhere anywhere state NEW Chain FORWARD (policy DROP) target prot opt source destination ACCEPT all anywhere anywhere state RELATED,ESTABLISHED ACCEPT all anywhere anywhere ACCEPT all anywhere anywhere Chain OUTPUT (policy ACCEPT) target prot opt source destination Chain logaccept (0 references) target prot opt source destination LOG all anywhere anywhere state NEW LOG level warning tcp-sequence tcp-options ip-options prefix "ACCEPT " ACCEPT all anywhere anywhere Chain logdrop (0 references) target prot opt source destination LOG all anywhere anywhere state NEW LOG level warning tcp-sequence tcp-options ip-options prefix "DROP " DROP all anywhere anywhere Once that rule is deleted: admin@acedia:/tmp/home/root# ip6tables -L Chain INPUT (policy ACCEPT) target prot opt source destination DROP all anywhere anywhere rt type:0 segsleft:0 ACCEPT all anywhere anywhere state RELATED,ESTABLISHED ACCEPT all anywhere anywhere state NEW ACCEPT all anywhere anywhere state NEW ACCEPT ipv6-nonxt anywhere anywhere length 40 ACCEPT all anywhere anywhere ACCEPT all anywhere anywhere ACCEPT udp anywhere anywhere udp spt:547 dpt:546 ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp destination-unreachable ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp packet-too-big ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp time-exceeded ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp parameter-problem ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp echo-request ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp echo-reply ACCEPT ipv6-icmp anywhere anywhere ipv6-icmptype 130 ACCEPT ipv6-icmp anywhere anywhere ipv6-icmptype 131 ACCEPT ipv6-icmp anywhere anywhere ipv6-icmptype 132 ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp router-solicitation ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp router-advertisement ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp neighbour-solicitation ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp neighbour-advertisement ACCEPT ipv6-icmp anywhere anywhere ipv6-icmptype 141 ACCEPT ipv6-icmp anywhere anywhere ipv6-icmptype 142 ACCEPT ipv6-icmp anywhere anywhere ipv6-icmptype 143 ACCEPT ipv6-icmp anywhere anywhere ipv6-icmptype 148 ACCEPT ipv6-icmp anywhere anywhere ipv6-icmptype 149 ACCEPT ipv6-icmp anywhere anywhere ipv6-icmptype 151 ACCEPT ipv6-icmp anywhere anywhere ipv6-icmptype 152 ACCEPT ipv6-icmp anywhere anywhere ipv6-icmptype 153 DROP all anywhere anywhere Chain FORWARD (policy DROP) target prot opt source destination DROP all anywhere anywhere state INVALID ACCEPT all anywhere anywhere state RELATED,ESTABLISHED DROP all anywhere anywhere rt type:0 segsleft:0 ACCEPT all anywhere anywhere DROP all anywhere anywhere state INVALID ACCEPT all anywhere anywhere ACCEPT ipv6-nonxt anywhere anywhere length 40 ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp destination-unreachable ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp packet-too-big ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp time-exceeded ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp parameter-problem ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp echo-request ACCEPT ipv6-icmp anywhere anywhere ipv6-icmp echo-reply ACCEPT tcp anywhere 2601:8a:500:5300:bccd:9377:d4ed:c8a9/128 state NEW tcp dpt:32400 ACCEPT tcp anywhere 2601:8a:500:5300:bccd:9377:d4ed:c8a9/128 state NEW tcp dpts:59911:59919 ACCEPT tcp anywhere 2601:8a:500:5300:bccd:9377:d4ed:c8a9/128 state NEW tcp dpt:ssh ACCEPT tcp anywhere 2601:8a:500:5300:bccd:9377:d4ed:c8a9/128 state NEW tcp dpt:www ACCEPT tcp anywhere 2601:8a:500:5300:bccd:9377:d4ed:c8a9/128 state NEW tcp dpt:https ACCEPT tcp anywhere 2601:8a:500:5300:bccd:9377:d4ed:c8a9/128 state NEW tcp dpt:9090 ACCEPT tcp anywhere 2601:8a:500:5300:bccd:9377:d4ed:c8a9/128 state NEW tcp dpt:8333 ACCEPT tcp anywhere 2601:8a:500:5300:bccd:9377:d4ed:c8a9/128 state NEW tcp dpt:1993 ACCEPT tcp anywhere 2601:8a:500:5300:bccd:9377:d4ed:c8a9/128 state NEW tcp dpt:ftp DROP all anywhere anywhere Chain OUTPUT (policy ACCEPT) target prot opt source destination DROP all anywhere anywhere rt type:0 segsleft:0 Chain NSFW (0 references) target prot opt source destination Chain PControls (0 references) target prot opt source destination ACCEPT all anywhere anywhere Chain UPNP (0 references) target prot opt source destination Chain logaccept (0 references) target prot opt source destination LOG all anywhere anywhere state NEW LOG level warning tcp-sequence tcp-options ip-options prefix "ACCEPT " ACCEPT all anywhere anywhere Chain logdrop (0 references) target prot opt source destination LOG all anywhere anywhere state NEW LOG level warning tcp-sequence tcp-options ip-options prefix "DROP " DROP all anywhere anywhere