Https proxy problem

example:client–>webserverA(apache proxy/Let’s Encrypt)–>webserverB it worked
client–>Cloudflare(no proxy DNS only)–>webserverA(apache proxy/Let’s Encrypt)–>webserverB it worked
client–>Cloudflare(proxy)–>webserverA(apache proxy/Let’s Encrypt)–>webserverB not worked
all used https

The error message “ERR_TUNNEL_CONNECTION_FAILED” typically indicates that the browser was unable to establish a secure tunnel through the proxy server. This can be caused by several factors, including incorrect proxy settings or issues with SSL certificates.

Here are a few troubleshooting steps you can try:

  1. Check the proxy server settings: Make sure that the proxy server settings in your browser are configured correctly. Check the host name, port number, and any authentication settings to ensure they are correct.
  2. Verify SSL certificates: Make sure that the SSL certificate used by the web server is valid and trusted by the browser. If the certificate is self-signed or expired, the browser will not be able to establish a secure connection.
  3. Check the firewall settings: Make sure that the firewall is not blocking the connection between the client and the web server. Check the logs for any error messages related to the connection.
  4. Test the connection directly: Try connecting directly to the web server without going through the proxy server. This will help you determine if the issue is with the proxy server or the web server.

If none of these steps resolve the issue, it may be helpful to check the logs on the web server to see if there are any error messages related to the connection. You can also try contacting Cloudflare support for further assistance.

if i used Cloudflare(no proxy DNS only model) it can access
only used Cloudflare(proxy model),web browser error:ERR_TUNNEL_CONNECTION_FAILED

Cloudflare is a reverse proxy you can put in front of your website. Cloudflare does not support HTTP tunneling.

if i only access webserverA Cloudflare(proxy model) also worked.
The problem is only happen uesd client–>Cloudflare(proxy)–>webserverA(apache proxy/Let’s Encrypt)–>webserverB

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