error502

[addisoncave]

what is the error 502?

[michanik]

The server was acting as a gateway or proxy and received an invalid response from the upstream server." There are many other 5xx server error messages, all of which boil down to: "The server failed to fulfill an apparently valid request

[raheel]

its server error means "The server you're trying to reach is sending back errors."

[mitsay]

my site error : 522 , i don't know how to fix it.