Question

Port 3306 blocked even though do, ufw, and iptables are configured to allow.

Posted on June 17, 2020
MySQL DigitalOcean Cloud Firewalls Firewall
Asked by damianyates

I am trying to remotely connect to my mysql instance and have been unsuccessful.

ufw shows port 3306 open iptables is not configured and the droplet firewall shows that it should be allowed. I have confirmed that my ip address is correct.

Please advise.

from droplet: user@host:~$ sudo ufw status [sudo] password for user: Status: active

To Action From

22 ALLOW Anywhere Apache Full ALLOW Anywhere 21/tcp ALLOW Anywhere 80 ALLOW Anywhere 443 ALLOW Anywhere 3306 ALLOW Anywhere 22 (v6) ALLOW Anywhere (v6) Apache Full (v6) ALLOW Anywhere (v6) 21/tcp (v6) ALLOW Anywhere (v6) 80 (v6) ALLOW Anywhere (v6) 443 (v6) ALLOW Anywhere (v6) 3306 (v6) ALLOW Anywhere (v6)

user@host:~$ sudo iptables -nL -V iptables v1.6.1

from DO interface:

Firewalls Default Inbound Type Protocol Port Range Sources SSH TCP 22 x.x.x.x HTTP TCP 80 All IPv4 All IPv6 HTTPS TCP 443 All IPv4 All IPv6 MySQL TCP 3306 x.x.x.x Outbound Type Protocol Port Range Destinations ICMP ICMP All IPv4 All IPv6 All TCP TCP All ports All IPv4 All IPv6 MySQL TCP 3306 All IPv4 All IPv6 All UDP UDP All ports All IPv4 All IPv6

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Bobby Iliev

Site Moderator

• June 17, 2020

Accepted Answer

Hi there @damianyates,

It sounds like that your MySQL service might be binding only on 127.0.0.1:3306 and if you want to access MySQL from the outside world, you need to change this to 0.0.0.0:3306.

To check if this is the case you can run the following netstat command: