Software⏱️ 4 min read📅 2026-06-11

How to Fix: How do I solve the "PuTTY X11 proxy: No authorisation provided" error?

Error resolving X11 proxy authorization for remote Firefox usage.

Quick Answer: Check if the DISPLAY environment variable is set correctly on the remote server.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🚀 How to Resolve This Issue
  3. ✨ Wrapping Up

The 'PuTTY X11 proxy: No authorisation provided' error is an issue that affects users trying to run graphical applications on a remote server over SSH, specifically when using Firefox or similar browsers. This error occurs when PuTTY's X11 forwarding fails to establish the necessary authorization for the X11 connection.

This error can be frustrating as it prevents users from accessing graphical applications on their remote servers. However, with the right troubleshooting steps and configurations, it is possible to resolve this issue and successfully use Firefox or other browsers with X11 forwarding.

🔍 Why This Happens

  • The primary reason for this error is that PuTTY requires specific authorization settings to be configured correctly before establishing an X11 connection. This includes setting the correct X11 display number, user ID, and password on both the local machine (laptop) and the remote server.
  • Another possible cause could be issues with the SSH server configuration or the remote server's network setup, which might be preventing PuTTY from establishing a stable X11 connection.

🚀 How to Resolve This Issue

Configuring PuTTY for X11 Forwarding

  1. Step 1: Step 1: Ensure that X11 forwarding is enabled in your SSH configuration. This can usually be done by adding the following line to your SSH client's configuration file (usually ~/.ssh/config): 'ForwardX11 yes'. You may also need to specify a specific display number, such as ':10.0', depending on the remote server's setup.
  2. Step 2: Step 2: Verify that the user ID and password used for X11 forwarding match those set up on the remote server. This is crucial for establishing the necessary authorization for the X11 connection.
  3. Step 3: Step 3: Check the remote server's network settings to ensure that it can handle X11 forwarding correctly. You may need to adjust firewall rules or port settings to allow the X11 connection.

Alternative Fix using SSH Agent

  1. Step 1: Step 1: Set up an SSH agent on your local machine (laptop) by running the command 'ssh-agent -s'. This will create a new SSH agent process that can store your private key and other authentication credentials.
  2. Step 2: Step 2: Add your private key to the SSH agent using the command 'ssh-add ~/.ssh/id_rsa'. This will allow you to authenticate with the remote server without having to enter a password every time.

✨ Wrapping Up

To resolve the 'PuTTY X11 proxy: No authorisation provided' error, try configuring PuTTY for X11 forwarding as described in Method 1. If this fails, consider using an alternative fix by setting up an SSH agent on your local machine as outlined in Method 2. By following these steps, you should be able to successfully use Firefox or other browsers with X11 forwarding on your remote server.

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