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

Posted June 17, 2020 1.1k views
MySQLFirewallDigitalOcean Cloud Firewalls

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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damianyates
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damianyates
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2 answers
bobbyiliev June 17, 2020

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:

  • netstat -plant | grep 3306

If this is the case, I would recommend following the steps here on how to change that:

https://www.digitalocean.com/community/tutorials/how-to-allow-remote-access-to-mysql

Hope that this helps!
Regards,
Bobby

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Many websites and applications start off with their web server and database backend hosted on the same machine. With time, though, a setup like this can become cumbersome and difficult to scale. A common solution is to separate these functions by setting up a remote database, allowing the server...
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damianyates June 17, 2020

PEBKAC - I forgot to restart the sql service after making that change earlier.
Thank you so much.

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