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Update not-yet-2024-04-17.md
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delgreco authored Apr 17, 2024
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Expand Up @@ -4,10 +4,18 @@ Recently, I stood up a simple JSON web service on Apache in my usual way, the ba

The calls from the commerical system hung. And hung. And finally timed out.

Friends, your author gets perplexed more easily than you might suspect. When a certain approach works, and works, and continues to work some two decades or more running... the mind grows lazy. Happy experience creates a box diffcult to think outside of.

Inside this mental box, I couldn't believe these client calls were even making it to my server. What's a hang? It's the network, of course. It's always the network, when things are hanging. Right?

After careful research (okay fine, after a conversation with chatGPT and various AIs) I arrived at the following effective `tcpdump` command with human readable output, and I was able to see...

```
sudo tcpdump -i [network interface] -n -t -vv -X -A src [IP address]
```

-- intr0 --
... that I was wrong (gasp!): the client call *was* making it to my server, but something *else* had to be hanging things up.




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