Problem: WiFi can't be joined

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The Problem

Although the WiFi Reception is pretty good (four bars) I can't join the network:
WiFiIssues01.png WiFiIssues02.png[1]

The Solution

  • Unplug all USB-Devices and retry...

In my case, an CM3 7-port USB 3.0 hub caused the problem, as soon as that is connected to the MacBook Air (even if nothing is connected to the hub, and the hub is powered down), WiFi is down. I exchanged the hub for another (Sitecom 7-port hub), and now it's working just fine.

  1. For full-text search: Could not join "WiFi". A connection timeout occurred.