Networking

The tag for problems that look like application bugs and are not. Seven posts, and the common thread is that the application was fine and something underneath it was quietly rewriting or dropping traffic.

A VPN connection where some sites load and others hang forever is almost always MTU, and there is a post here that walks through proving it rather than guessing. A soundbar that refuses every firmware update turned into a man-in-the-middle exercise with Wireshark to find out what it was actually asking for. Behind Cloudflare and Traefik, every visitor arrived as the same internal address until the proxy chain was told whom to trust. A website that suddenly rendered as bare HTML with no CSS turned out to be a change on their side, visible in the browser console.

Several of these are from 2017 to 2020 and name specific software versions. The diagnostic approach is the durable part.

2017–2022 / 7 posts