Can't access other servers over private network

Posted July 6, 2014 10.7k views

I’ve turned on private networking on two droplets, but I can’t even get them to ping each other over the private network. Any help?

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Submit an Answer
5 answers

Do you have a firewall installed that might be blocking ICMP packets? I believe UFW does that by default. If you’re using UFW, try disabling it and trying to run ping again.

Also, what’s the output of the following command?

sudo sysctl net.ipv4.icmp_echo_ignore_all
  • Also, what’s the output of the following command?


    Yes, there is a firewall in place. I’m trying to set up a second droplet to host databases for Wordpress installs on the first droplet. I’ve opened port 3306 on the second droplet, but can’t access it from the first. I thought that pinging it would be easy enough…

  • Try running nc -zv database-droplet-ip 3306. If that doesn’t work, check if MySQL is listening port 3306 on the database droplet:

    sudo netstat -plutn | grep 3306

nc -zv database-droplet-ip 3306 timed out (I replaced database-droplet-ip with the private network ip of the database droplet).

sudo netstat -plutn | grep 3306 on the database droplet returned:

tcp        0      0  *               LISTEN      8312/mysqld
  • Looks like a firewall is blocking connections to MySQL. Please pastebin the output of:

    • sudo ufw status if you’re using UFW
    • sudo iptables -L -n -v if you’re using iptables

    on both droplets.

It turns out that one of my droplets wasn’t properly configured for private networking. I have it all sorted out now. Thanks.

Hi @kamaln7, I have the same problem. I did all the steps you mentioned and still no luck connecting to mysql. But running nc -zv database-droplet-ip 3306 succeeded w/ my ufw on, the database ip I used is the private network address. When I try to turn off my ufw I have no trouble connecting to mysql, also when I allow my public ip on ufw it connects perfectly.