curl -x http://your-proxy-server:port -fsSL https://docker.com Use code with caution. Alternatively, check your environment variables: echo $http_proxy echo $https_proxy Use code with caution.
Systems using iptables , ufw , or firewalld may be configured to block outbound traffic on port 443. curl -x http://your-proxy-server:port -fsSL https://docker
If you are running this from within a container or VM, a Maximum Transmission Unit (MTU) mismatch can cause HTTPS handshakes to fail and appear as connection issues. Step-by-Step Solutions 1. Test Basic Connectivity If you are running this from within a
Verify if the issue is specific to curl or a broader network problem. Try to "ping" the domain or use telnet to check the port: Try to "ping" the domain or use telnet
If you are behind a corporate firewall, curl needs to know about your proxy. You can pass it directly in the command: