For User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36 the WebSockets test fails.
Indeed it does fail. It will be fixed in the next minor SSL Labs release. Thanks for reporting this problem.
In the meantime, Chrome 37 doesn't allow plaintext WebSocket connections from an encrypted origin.
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