It doesn't sound like someone tried to hack them to me. It sounds more like their connection is broken. Invalid reponse from an upstream server sounds like a problem, not a hack.
I could be wrong, but to me it just sounds like they're down.
EDIT: I think I found out what it means.
Quote:
HTTP Error 502 - Bad gateway
A server (not necessarily a Web server) is acting as a gateway or proxy to fulfil the request by the client (e.g. your Web browser or our CheckUpDown robot) to access the requested URL. This server received an invalid response from an upstream server it accessed to fulfil the request.
This usually does not mean that the upstream server is down (no response to the gateway/proxy), but rather that the upstream server and the gateway/proxy do not agree on the protocol for exchanging data. Given that Internet protocols are quite clear, it often means that one or both machines have been incorrectly or incompletely programmed.
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