Port Forwarding in AWS LightSail or EC2 machines via SSH

I have a Smart Lighting system at home powered by Philips Hue. I was trying to connect to my Philips Hue Bridge’s IP remotely without implementing Port Forwarding on my WiFi Router.

Instead of setting up an EC2 instance, I moved ahead with a Lightsail instance, which unlike EC2, is much less complicated, and also provides the download of private key, the firewall changes etc. upfront for easy and convenient access.

Disclaimer: The process I mention below may not be optimum if you are opening up sensitive/unprotected ports without appropriate security measures. Use your own judgement before you implement Port Forwarding.

Following is an example of what I planned to do. Basically, I wanted to access Port 9090 on my Lightsail instance to reach the Philips Hue Bridge at my home.

Port Forwarding Setup using AWS Lightsail/EC2

  • I had opened Port 9090 through the Firewall option in Lightsail
  • I also had set a password for root user by using the command sudo passwd

However, the port forwarding did not work because Lightsail’s SSH does not support port forwarding by default.

I made the following changes in /etc/ssh/sshd_config to enable port forwarding.

# Changed the following line
PermitRootLogin yes

# Added at the bottom the following
UseDNS no

ClientAliveInterval 180
ClientAliveCountMax 3

GatewayPorts yes

Then I restarted ssh using root

/etc/init.d/ssh restart

After that I was able to do the port forwarding smoothly by executing the following command on my Desktop at home (your needs may vary, so modify accordingly)

ssh -i key.pem -R *:9090:192.168.0.75:80 root@101.102.103.104

Now from a remote machine, if I reach out to Port 9090 on 101.102.103.104, it works well. The command man ssh will help you understand the -L (Local Forward to Remote) & -R (Remote Forward to Local) option better. You can also use PuTTY to implement Port Forwarding.

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