Networking & Firewall (Ss/Netstat/Iptables/Nftables/Curl)
Stop curl from lying to you about silent connection failures
🧩 The Challenge
Everyone has spent an hour chasing a ghost in the firewall, convinced their packet is getting through, when actually curl is just failing silently because of a misconfigured proxy or a hidden header mismatch. It’s infuriating when you think the server is down, but the client is just playing games with you.
đź’ˇ The Fix
Use the verbose and trace flags to force curl to dump every single handshake and header exchange to your terminal. It turns a black box into a clear roadmap of exactly where the conversation dies.
curl -v --trace-ascii /dev/stdout http://your-problematic-endpoint.com⚙️ Why It Works
Adding the trace-ascii flag forces a hex dump of all incoming and outgoing data, which bypasses the standard “curl just died” ambiguity and shows you if you are hitting a WAF or getting rejected by a load balancer mid-request.
🚀 Pro-Tip: Pipe it to less if you are debugging a massive JSON response so your terminal doesn’t turn into a scrolling nightmare.
Linux Tips & Tricks | © ngelinux.com | 7/28/2026