This YouTube error message had been bothering me for months:
An error occurred. please try again later.Learn More
It turns out that YouTube needs at least one of RC4 options, see about:config and search for “rc4”. I just randomly picked one from the six options, which was security.ssl3.rsa_rc4_128_sha. Reloaded the page and the video played. It is required for both Flash and HTML5 video playbacks, and it doesn’t matter if you are signed in or not. Originally, I thought signing out would help, but that doesn’t seem to be all the cases.
Funny story is that those RC4 options was intentionally disabled last year by me in Firefox. I couldn’t really tell if the playback issue surfaced right after I did so, but I knew it had been going on for long time and I never made the connection between two.
I tried starting up without any add-on enabled, cleaning up cookies and caches, nothing would work. Glad that I never did a full reset of Firefox. Yes, that might make me realize RC4 is the key, but I might not if I do too many tasks at once to get Firefox back to what I would like.
This solution was post on May 9, so I only suffered another month before I finally got the right answer. But I will still not re-enable RC4 permanently just for watching videos on YouTube.
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