How to fix the “407 Proxy Authentication Required” Error?

What is the “407 Proxy Authentication Required” Error?

The “407 Proxy Authentication Required” error is a status code in HTTP that arises when the server can’t fulfill a request due to the absence of authentication credentials when a client and server are connected via a proxy server.

In essence, the client’s authentication by the proxy fails.

Causes of 407 Proxy Authentication Required Error

The triggers for the “407 Proxy Authentication Required” error could be:

Incorrect or absent credentials:

The client might have given wrong or no credentials while trying to authenticate with the proxy server.

Network setup:

Problems with the client’s network setup, like wrong proxy settings, can lead to a 407 status code.
Access limitations. Conflicts with third-party software.

How to fix the “407 Proxy Authentication Required” Error?

To fix the “407 Proxy Authentication Required” error, you could consider the following solutions.

On the Client Side:

If you encounter a 407 error on your computer but not on your phone, the problem might lie with the device’s digital ID or security software.

Verify the URL

You need to ensure that you’re inputting the correct URL.

While it might seem trivial, a small typo can trigger the HTTP 407 error.

Hence, it’s advisable to double-check the URL, clear your cache, and try accessing the website again.

Disable Your Plugins

If you’ve recently made changes that appear to coincide with the error, it’s worth investigating.

If the error is occurring on your website, you might want to inspect any plugins, themes, or extensions you’ve recently added or updated.

Examine and Revert Recent Changes

If you can’t identify any client-side issues that might be causing the problem, the final step before proceeding is to perform a restoration.

If you can roll back the site to a state prior to the error’s appearance, this will help determine if the problem was caused by a recent change or an external factor.

If feasible, create a backup before rolling back so you can restore the current version if the error continues. Otherwise, you might roll back and still face the same issue.

On the Server Side:

Verify proxy settings

Ensure that your proxy settings are correctly configured. This includes checking the proxy server address, port, and protocol used.

Supply correct credentials

Make sure you’re providing the correct username and password for the proxy server.

If you’re unsure, you can check with your network administrator or the person who provided you with the proxy details.

Debug the code or scripts

If you’re encountering this error while running a script or a piece of code, try to debug it.

Look for sections where proxy settings are defined or where HTTP requests are made, and ensure they are correct.

Deactivate third-party software

Some third-party software, like antivirus or firewall applications, can interfere with your network connections.

Try disabling these temporarily to see if the problem persists.

Review the network and firewall settings

Incorrect network or firewall settings can cause this error. Make sure your firewall is not blocking your access to the proxy server.

Clear your browser’s cache and cookies

If the error is caused by corrupted or expired cookies or cache, clearing them could help.

Sometimes, clearing your browser’s cache and cookies can resolve network-related errors.

When you clear them, you get new info from the website’s server.

If you use Google Chrome, here’s how to clear its cache:

  1. Click the three dots in the top-right corner of your window. You can also use the keyboard shortcut (Ctrl + H).
  2. Go to History History.
  3. Click on Clear Browsing Data.
Clear browsing data
  1. A new window will appear. Choose the Time range, if you wish to erase all data, select All Time.
Choose the Time range
  1. Select what you’d like to clear- this could be browsing history, cookies, and other site data, or cached images and files.
  2. Then, hit the Clear Data button.

Reach out to the network administrator

If you’re in a managed network environment (like an office or university network), the network administrator may have specific settings or credentials you need to use.

Ubuntu-specific solutions:

If you’re using Ubuntu, you could consider:

Editing the apt configuration file

This file contains the APT tool’s configuration, including proxy settings.

Managing special characters in the username or password

If your username or password contains special characters, they might need to be escaped or encoded.

Adjusting proxy settings via the Linux Network wizard

This GUI tool lets you change network settings, including proxy settings easily.

Using the CNTLM tool for NTLM authentication:

If your proxy uses NTLM authentication, this tool can help.

Setting proxy environment variables:

You can set the http_proxy and https_proxy environment variables to define your proxy settings.

Using the Synaptic Package Manager:

This GUI package manager for Ubuntu also allows you to define proxy settings.

Remember, it’s always a good idea to back up your data before making significant changes to your system settings.

If you’re unsure about any step, seek help from a professional or someone with technical expertise.


In conclusion, the “407 Proxy Authentication Required” error is an HTTP status code that signifies the server’s inability to fulfill a request due to missing or incorrect authentication credentials when a client and server are connected via a proxy server.

This error can be triggered by various factors, including incorrect or absent credentials, issues with network setup, access limitations, and conflicts with third-party software.

To fix this error, several solutions can be considered.

On the client side, these include verifying the URL, disabling plugins, and examining and reverting recent changes.

If the error persists, it might be necessary to roll back the site to a state prior to the error’s appearance.

By following the provided solutions above on how to fix the 407 Not Acceptable error, you can rest assured that you’ll be able to resolve this issue.

For further learning, you can also check the following HTTP status code:

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