Hello everyone, I have a problem with accessing Docker containers for any other port than 80. Previously it worked and I had services accessible on ports 5000 and 7000 in addition to a nginx server installed directly on the droplet. I recently do a dist-upgrade to Ubuntu 18.04.1 LTS and that may have broken stuff. What works: accessing a page on port 80 or 443 served by nginx (without docker) accessing my docker container from another machine if bind on port 80 accessing my docker container from the localhost regardless of port What doesn’t work: accessing a page on port 81 served by nginx (without docker) accessing my docker container if bind to port 5000 or 7000 So it seems that there is a problem with other ports than 80 and 443 for serving content on the internet. I have not DO Firewall configured. I tried to look iptables stuff but I understand very little but don’t find anything suspicious. I tried various things for hours be still cannot solve the issue. Could you help me?

Unreachable content (Docker containers) on other port than 80

Posted October 1, 2018
Docker

Hello everyone,

I have a problem with accessing Docker containers for any other port than 80. Previously it worked and I had services accessible on ports 5000 and 7000 in addition to a nginx server installed directly on the droplet. I recently do a dist-upgrade to Ubuntu 18.04.1 LTS and that may have broken stuff.

What works:

accessing a page on port 80 or 443 served by nginx (without docker)
accessing my docker container from another machine if bind on port 80
accessing my docker container from the localhost regardless of port

What doesn’t work:

accessing a page on port 81 served by nginx (without docker)
accessing my docker container if bind to port 5000 or 7000

So it seems that there is a problem with other ports than 80 and 443 for serving content on the internet. I have not DO Firewall configured. I tried to look iptables stuff but I understand very little but don’t find anything suspicious. I tried various things for hours be still cannot solve the issue.

Could you help me?

Netspring

Alex • October 1, 2018

Try this thingy: https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-ubuntu-18-04

Submit an answer

You can type!ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

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.

Netspring • October 10, 2018

Thanks guys, I finally understood & solved the issue. First, I created subdomains and set up the web server to act as a reverse proxy. Second, a colleague informed me that it is the network firewall that is blocking most ports at work.

unixynet • October 1, 2018

Hi,

I will need to take a closer look at the server. Feel free to get in touch (it’s joe at domain in my username) and I’ll fix it for you.

Cheers

Join the DigitalOcean Community