What Causes a 502 Bad Gateway Error?

Ok, so I know a 404 is not found, while 403 is access denied. Anyone know what causes a 502, and what I could do to minimize it?
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  1. Well, it's mostly beyond your control. A 502 usually indicates there's something wrong with a website's server, or the way a website's servers communicate with each other. Another reason is also because there's something wrong with your service provider.

    In most cases, the 502 should go away after a few hours. If you're into technical terms, you can check this out for more details:
  2. This topic has been closed by Mousemonkey
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