CloudFlare Tunnel not working with HTTPS

SSE and Zero trust Cloudflare Tunnel
1

What is the name of the domain?

xxx.economizafloripa.com.br

What is the error number?

curl: (56) CONNECT tunnel failed, response 400

What is the error message?

curl: (56) CONNECT tunnel failed, response 400

What is the issue you’re encountering

https not working

What steps have you taken to resolve the issue?

I am running “simple-proxy.exe” on my Windows with a cloudflare tunnel. The command below works fine:

curl.exe --proxy “http://xxx.economizafloripa.com.br:80” “http://httpforever.com/”

However if I try to access any https website I get the error 400:

curl.exe --proxy “http://xxx.economizafloripa.com.br:80” “https://www.sitepor500.com.br”

I am 100% sure the error is related to Cloudflare Tunnel because if I run this command below directly on my local computer, the HTTPS works just fine:

curl.exe --proxy “http://localhost:8585” “https://www.sitepor500.com.br”

Cloudflare tunnel is doing something weird with HTTPS because when I use the proxy locally to access an external resource with https, everyting works fine.

Firewall is completely disabled, nothing wrong is being done on my end.

2

Using Windows IIS or not? If yes, which version? :thinking:

Have you got SSL certificate installed on your Windows machine for your Website? Is your Website running fine over HTTPS (bound to the port 443) and with a valid SSL certificate at the origin host/server or rather not?

If not, then noTLSVerify option should be enabled from the Zero Trust dashboard for your tunnel public hostname:

Have you tried switching to http2 protocol instead? :thinking:
Might be your ISP might not support Quic protocol. Could you select other protocol e.g. http2, using the command and retry again as follows on the instructions from below article? :thinking:

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