4000

Quick Fix

Open the browser’s settings, clear the cache and cookies, then restart the browser. If the problem persists, disable any VPN or proxy and try again.

What it Means

Error 4000 indicates the browser could not establish a secure connection to the requested server. It often appears when the server’s SSL/TLS certificate is invalid, expired, or the network blocks the connection.

Possible Causes

• 1
  Expired or mismatched SSL/TLS certificates
• 2
  Network firewall or proxy blocking HTTPS traffic
• 3
  Outdated browser version
• 4
  Incorrect system date/time

Step-by-Step Solutions

1. Update Browser

   Open the browser menu, go to Help > About, and let it download the latest update. This ensures you have the newest security patches.

2. Check System Clock

   On Windows, right‑click the time, select Adjust date/time, and enable automatic sync. On macOS, go to System Settings > Date & Time and check the box. A wrong clock can cause SSL errors.

3. Clear Cache and Cookies

   Navigate to Settings > Privacy > Clear browsing data. Select Cached images and files, Cookies and other site data, then clear data. This removes stale credentials.

4. Disable VPN/Proxy

   If you’re using a VPN or proxy, temporarily turn it off to see if the connection succeeds. Some services block certain ports.

5. Reset Network Settings

   On Windows, run cmd as admin and execute "netsh winsock reset" and "netsh int ip reset". Then restart the computer.

   netsh winsock reset && netsh int ip reset

Commands You Can Try