How to set up firewall in Tigervnc on Debian

This article describes how to configure a firewall for a TigerVNC server on a Debian system. We will be configuring using Uncomplicated Firewall (UFW), a user-friendly firewall management tool.

Step 1: Install UFW

First, you need to install UFW:

 sudo apt-get update
sudo apt-get install ufw

Step 2: Enable UFW

After the installation is complete, enable UFW:

 sudo ufw enable

Step 3: Allow TigerVNC port access

TigerVNC uses port 5900 by default. Allow TCP connections to this port:

 sudo ufw allows 5900/tcp

Step 4: Reload UFW

Apply new firewall rules:

 sudo ufw reload

Step 5: Verify UFW status

Check that UFW is configured correctly and takes effect:

 sudo ufw status

Step 6: (Optional) Set the default policy

For enhanced security, the default policy can be set to deny all inbound connections and allow all outbound connections:

 sudo ufw default deny incoming
sudo ufw default allow outgoing

Important tips:

• The above steps are based on UFW. If you use iptables or other firewall tools, please refer to its relevant documentation.
• Before modifying firewall rules, be sure to understand the meaning of these rules to avoid accidentally blocking necessary services.
• Check and update firewall rules regularly to deal with changing security threats.

Hopefully, the above steps can help you safely configure the TigerVNC server firewall on the Debian system. If you have any questions, please refer to the official UFW documentation for more information.

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