I'm seeing these today as well.
"The remote server returned an error: (502) Bad Gateway."
On the following two queries...
&dimensions=ga%3Adate%2Cga%3Abrowser%2Cga%3AbrowserVersion%2Cga
%3AisMobile%2Cga%3AjavaEnabled%2Cga%3AoperatingSystem%2Cga
%3AoperatingSystemVersion&metrics=ga%3Avisits&segment=gaid%3A
%3A-1&sort=ga%3Adate&start-date=2011-12-27&end-date=2012-02-01&start-
index=1&max-results=9999
&dimensions=ga%3Adate&metrics=ga%3Avisits%2Cga%3Apageviews%2Cga
%3AnewVisits%2Cga%3Aentrances%2Cga%3Aexits%2Cga%3Abounces%2Cga
%3AtimeOnPage%2Cga%3AtimeOnSite&segment=gaid%3A%3A-1&sort=ga
%3Adate&start-date=2012-01-31&end-date=2012-02-01&start-index=1&max-
results=9999