welcome to the n8n community @ali_ferkhas
I would first test basic outbound connectivity from the n8n host itself (DNS resolution, firewall, proxy/VPN, and whether the server can reach public HTTPS sites), because if even the HTTP Request node fails everywhere, the problem is more likely the server/network environment than the workflow configuration.
Hey! Can you share the actual error message youre getting and how youre running n8n (Docker, npm, cloud, etc)? A screenshot of the failing node config would help a lot too.