Helpful tip: Chromecast is not hip with mega-long passwords
Too long a password will choke your Chromecast
For a first retail run, it is fair to say that the Chromecast has enjoyed a nearly perfect execution. You might be at the store buying stuff and see a Chromecast at the check-out lane. Do not fret, just get it; as we said in our review, “The price makes it an impulse buy you won’t regret.”
It turns out that his password (which created using a random character generator) was too long. At 128 characters, apparently Chromecast said, “Can’t pull it off, sorry.” Of course, seeing as how WPA2 passwords have a 64-character limit, we are not sure how anything else happened to connect, but to each their own. After changing the password to something shorter, the Chromecast connected right up.
source: AndroidCentral
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Things that are NOT allowed: