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How to disable firewall or IP tables on Ubuntu Linux server

Login on the console with a sudo user (root)

Approach 1: Simple

To List UFW (default firewall on Ubuntu) run the following command

$ sudo ufw status verbose

Sample output

Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), deny (routed)
New profiles: skip

To Action From
— —— —-
66.61.246.79 80/tcp ALLOW IN Anywhere
66.61.246.78 80/tcp ALLOW IN Anywhere

To disable UFW firewall run the following command

$ sudo ufw disable

——————————————————————————————————

Old school Approach

Alternatively, run the following command to list any existing firewall rules

$ sudo iptables -L –n

Sample output

Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT udp — 0.0.0.0/0 0.0.0.0/0 udp dpt:53
ACCEPT tcp — 0.0.0.0/0 0.0.0.0/0 tcp dpt:53
ACCEPT udp — 0.0.0.0/0 0.0.0.0/0 udp dpt:67
ACCEPT tcp — 0.0.0.0/0 0.0.0.0/0 tcp dpt:67

Chain FORWARD (policy ACCEPT)
target prot opt source destination
ACCEPT all — 0.0.0.0/0 172.148.102.0/24 state RELATED,ESTABLISHED
ACCEPT all — 172.148.102.0/24 0.0.0.0/0
ACCEPT all — 0.0.0.0/0 0.0.0.0/0
REJECT all — 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
REJECT all — 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable

Chain OUTPUT (policy ACCEPT)
target prot opt source destination

To stop and Flush all the rules run the following commands

$ sudo iptables -X
$ sudo iptables -t nat -F
$ sudo iptables -t nat -X
$ sudo iptables -t mangle -F
$ sudo iptables -t mangle -X
$ sudo iptables -P INPUT ACCEPT
$ sudo iptables -P FORWARD ACCEPT
$ sudo iptables -P OUTPUT ACCEPT

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