Networking & Firewall (Ss/Netstat/Iptables/Nftables/Curl)

Stop your port scans from getting lost in the noise

🧩 The Challenge

Dealing with connections that just hang indefinitely is enough to drive anyone up the wall. You sit there waiting for a response, but your firewall or a distant middlebox is just silently swallowing the traffic.

💡 The Fix

Use curl’s verbose flags combined with a custom timeout to force the client to actually report why the handshake is dying instead of leaving you guessing.

curl -v --connect-timeout 5 http://your-service-address:port

⚙️ Why It Works

Setting a hard timeout keeps your terminal from hanging forever while the verbose output exposes every failed TCP handshake attempt or dropped packet.

🚀 Pro-Tip: Pipe that to grep -E ‘Connected|Failed’ if you are debugging a flaky cluster load balancer.

Linux Tips & Tricks | © ngelinux.com | 8/11/2026