I've recently had a situation where I was running HTTP server (written in Go) on port 8080 on my Ubuntu machine and had to access it from my Windows machine (which was on the same network). At first I got a connection time out error and I assumed Ubuntu was just rejecting connections for not having 8080 port opened. I was right. I used UFW (Uncomplicated Firewall) to open port on my Linux machine. UFW comes with Ubuntu (18.04 in my case) so didn't have to install any additional packages.
Let's see all ufw commands:
$ ufw --help
Usage: ufw COMMAND
Commands:
enable enables the firewall
disable disables the firewall
default ARG set default policy
logging LEVEL set logging to LEVEL
allow ARGS add allow rule
deny ARGS add deny rule
reject ARGS add reject rule
limit ARGS add limit rule
delete RULE|NUM delete RULE
insert NUM RULE insert RULE at NUM
route RULE add route RULE
route delete RULE|NUM delete route RULE
route insert NUM RULE insert route RULE at NUM
reload reload firewall
reset reset firewall
status show firewall status
status numbered show firewall status as numbered list of RULES
status verbose show verbose firewall status
show ARG show firewall report
version display version information
Application profile commands:
app list list application profiles
app info PROFILE show information on PROFILE
app update PROFILE update PROFILE
app default ARG set default application policy
You need to be root in order to perform majority of ufw operations.
To check firewall's status (whether it's active or not):
$ sudo ufw status
To enable it:
$ sudo ufw enable
To open 8080 port for TCP connections:
$ sudo ufw allow 8080/tcp
To verify the result:
$ sudo ufw status
Status: active
To Action From
-- ------ ----
8080/tcp ALLOW Anywhere
8080/tcp (v6) ALLOW Anywhere (v6)
Let's see all ufw commands:
$ ufw --help
Usage: ufw COMMAND
Commands:
enable enables the firewall
disable disables the firewall
default ARG set default policy
logging LEVEL set logging to LEVEL
allow ARGS add allow rule
deny ARGS add deny rule
reject ARGS add reject rule
limit ARGS add limit rule
delete RULE|NUM delete RULE
insert NUM RULE insert RULE at NUM
route RULE add route RULE
route delete RULE|NUM delete route RULE
route insert NUM RULE insert route RULE at NUM
reload reload firewall
reset reset firewall
status show firewall status
status numbered show firewall status as numbered list of RULES
status verbose show verbose firewall status
show ARG show firewall report
version display version information
Application profile commands:
app list list application profiles
app info PROFILE show information on PROFILE
app update PROFILE update PROFILE
app default ARG set default application policy
You need to be root in order to perform majority of ufw operations.
To check firewall's status (whether it's active or not):
$ sudo ufw status
To enable it:
$ sudo ufw enable
To open 8080 port for TCP connections:
$ sudo ufw allow 8080/tcp
To verify the result:
$ sudo ufw status
Status: active
To Action From
-- ------ ----
8080/tcp ALLOW Anywhere
8080/tcp (v6) ALLOW Anywhere (v6)
1 comment:
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