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Small requests succeed but large uploads hang mid-flight. What is your leading theory and how do you prove it?

The signature is unmistakable once seen: handshakes complete, then the connection freezes at the same byte count every time. Here is the probe sequence and the fixes, ranked.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

The signature is unmistakable once seen: handshakes complete, then the connection freezes at the same byte count every time. Here is the probe sequence and the fixes, ranked.

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UP NEXT ON YOUR JOURNEY

Next in this trackYou are on a locked-down host with no agents installed. Which /proc files answer your first troubleshooting questions?Next in this trackThis host must serve three VLANs with redundant NICs. Explain VLAN subinterfaces and where each bonding mode fits.Next in this trackOne stream across a 10Gbps transatlantic link crawls while ping looks perfect. What is limiting the throughput?

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