So my company has a webserver on port 4000 (Cloudflare) and mongodb on port 27017. I tried to do ufw allow 27017/tcp, or ufw allow 27017, ufw allow 4000, ufw allow 4000/tcp. However when I’ve done an nmap scan the ports are still closed for some reason. Why is this? What am I missing? I’ve tried to enable nginx and apache but we already have a webserver on cloudflare, so isn’t it mood point?
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Hello there,
What is your problem? Your droplet has this ports open but you can’t to connect to them?
From your Droplet
Check out your open ports
- netstat -putan
Check out the current status of your firewall
- sudo ufw status verbose
From outside your Droplet
Check out your open ports
- nmap your_droplet_ip
If you need to check a specific port
- nmap -p 4000 your_droplet_ip
Hope this helps,
Sergio Turpín
Hi there,
In order for you to be able to access those services externally, besides allowing the ports via your firewall, you need to make sure that they bind on 0.0.0.0 rather than 127.0.0.1.
For example, with MongoDB you can do that by following the steps here:
For the service that is listening on 4000, can you confirm what type of service is it?
Best,
Bobby
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