Failed To Connect To | Download ((link)).docker.com Port 443 Connection Refused

For Docker specifically, you may also need to configure the Docker systemd service to use these proxies once it is installed. Step 3: Update DNS Settings

If you are working in a corporate or school environment, you likely sit behind a proxy. Even if your browser works, your terminal might not. Check if proxy variables are set: env | grep -i proxy For Docker specifically, you may also need to

If it hangs at "Connecting," it is a issue. Check if proxy variables are set: env |

First, determine if the issue is specific to Docker or your entire internet connection. Run a simple ping or curl to a different site: curl -I https://google.com If it returns "Connection Refused" instantly, the on

To see exactly where the connection is failing, use OpenSSL to trace the handshake: openssl s_client -connect ://docker.com

Your environment requires a proxy to reach the internet, but Docker/curl isn't aware of it.

If it returns "Connection Refused" instantly, the on your end or a proxy is rejecting it. Summary Checklist Can you ping 8.8.8.8? (Basic connectivity) Does curl -I https://google.com work? (HTTPS connectivity) Is your https_proxy environment variable set? (Proxy check)