407

Quick Fix

Open your browser’s proxy settings, enter the correct username and password, then reload the page.

What it Means

HTTP 407 tells the browser that the proxy server blocks the request until you authenticate. The browser stops until valid credentials are supplied.

Possible Causes

• 1
  Proxy server requires authentication
• 2
  Wrong or missing proxy credentials
• 3
  Proxy misconfiguration
• 4
  Browser not set to use the corporate proxy
• 5
  Network firewall blocking authentication

Step-by-Step Solutions

1. Locate Proxy Settings

   Open the browser menu, go to Settings > Network > Proxy, and view the current proxy configuration. This shows whether a proxy is enabled and what address it uses.

2. Enter Correct Credentials

   Input the username and password provided by your network admin. Save the changes and test by reloading the page.

3. Test Connection

   After saving, navigate to a site that normally works. If the error disappears, the credentials are correct.

4. Clear Cached Credentials

   Sometimes old credentials are stored. On Windows, run `netsh winhttp reset proxy`; on macOS, use `networksetup -setwebproxystate Wi-Fi off` then on again.

   netsh winhttp reset proxy

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