Question

WAF is blocking traffic

So I tried setting up a web access firewall. On the first firewall, all ports were open. I changed it to SSH 22, port 4000 (webserver), 27017(modgod and mongose). The mobile app isn’t able to connect. What step am I missing? When I’ve done an nmap and netstat scan the ports are said to be closed.


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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.

You can verify if this is the case with the following command:

netstat -plant | grep 4000

For example, if you want to access your MongoDB externally, you can do that by following the steps here:

https://www.digitalocean.com/community/tutorials/how-to-configure-remote-access-for-mongodb-on-ubuntu-20-04

For the service that is listening on 4000, can you confirm what type of service is it?

Best,

Bobby