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Question

Couldn't fetch api while firewall is enabled.

Hello.

I have a website on digitalocean and I just followed the tutorial down below so i got my certificate and now my website uses https protocol. https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-20-04

Everything is good to this point.

But there is a but. :)

I’m using node.js on my website. It connects to my mongoDB cluster and it creates an api url based on my domainname or/and droplet IP address.

For example my API_URL is: 123.45.67.89:5000/items I fetch that URL and do somethings on my website based on items.

But as i followed https protocol tutorial, i just enabled my firewall and because of that i guess, firewall is blocking my API URL and i get error on fetch.

I also can’t reach that API_URL(123.45.67.89:5000/items) manually.

While firewall is closed i can fetch my api.

What should i do?

Thanks. Regards.

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Janusz Szeligowski • October 5, 2020

Hi, Since you followed the tutorial, I guess you configured firewall rules using ufw management tool. If I am right, list the rules and check if communication is allowed on port TCP 5000

sudo ufw status verbose

If it is not allowed, you can allow it adding a rule:

sudo ufw allow 5000/tcp

Here is the tutorial on configuring firewall with ufw management tool: https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-ubuntu-20-04

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