By rajeev29five
What I want to achieve
success response
The response I am getting
curl: (7) Failed to connect to 128.199.27.21 port 9898: Connection refused
What I have done so far
I just created an Ubuntu droplet, I am able to ssh to this droplet without any problem. Deployed my API, API calls are success if I do curl with localhost:port.
However when I try to call the API from my personal laptop it fails. I am unable to ping droplet’s IP from my personal laptop. I searched various websites for possible answers, found few solutions stating enabling/disabling and allowing particular IP using “ufw” but that solution is not working. I even tried modifiying Firewall rules through Digital Ocean Control Panel to allow inbound traffic for tcp/udp/ssh/http/https/icmp from all IPv4 and IPv6 but it isn’t working either.
OUTPUT:
lsof -i :9898
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
R 231 root 15u IPv4 69259 0t0 TCP localhost:9898 (LISTEN)
ufw status
Status: active
To Action From
-- ------ ----
OpenSSH ALLOW Anywhere
22/tcp ALLOW Anywhere
80/tcp ALLOW Anywhere
443/tcp ALLOW Anywhere
OpenSSH (v6) ALLOW Anywhere (v6)
22/tcp (v6) ALLOW Anywhere (v6)
80/tcp (v6) ALLOW Anywhere (v6)
443/tcp (v6) ALLOW Anywhere (v6)
Even disabled ufw but it is still not working
Deleted the Firewall rules from DigitalOcean Control Panel still no response.
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Accepted Answer
Hi @rajeev29five:
@baraboom pointed out a critical issue in your API application. It must also listen on your droplet IP 128.199.27.21, not just localhost. Please reconfigure your application or modify its source code.
Also, if you want to enable UFW, add a new rule to allow incoming connections to your API application:
- sudo ufw allow to 128.199.27.21 port 9898 proto tcp
By default, UFW allows ping requests. If for some reason you are unable to ping your droplet, read this Ubuntu wiki page to learn how to enable ping requests.
Hi! If you haven’t figured it out yet, you need to configure your service to bind to the IP address of the Droplet vs “localhost”
This line shows its only listening on localhost which is why your curl works:
R 231 root 15u IPv4 69259 0t0 TCP localhost:9898 (LISTEN)
The key part of that line is localhost:9898, which is the “interface” and “port” combo.
To correct this, you can configure service via conf file or command flag when you start it to bind to the IP address of your droplet. When you’re done you should see something like 0.0.0.0:9898 (for any interface) or 192.168.1.55:9898 (whatever your Droplet IP is).
Hope this helps and if you’re still stuck, let us know what the underlying software is and we can see what is need to bind to the IP address.
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