We have SharePoint 2013 with Enterprise Search site collection configured. It worked fine for three plus months now, but a week ago it started to display a rather strange behavior. A user enters a string to search, and upon running the search, the results show up as expected. But if one runs the same search immediately or later, an error comes up saying:
"Sorry, something went wrong." Expanding the details of the error shows: "Unexpected response from server. The status code of response is '0'. The status text of response is ".
I followed all advice related to this error, which none is quite the same since our status text response looks like null rather than a specific value.
I cleaned the cache for the farm on both app servers, I re-indexed and re-run search - no changes. Immediately after re-running search, one can check again the same strings that were run before, but re-running them a second time results in the failure again; it seems like a latched cache flag somewhere, but I have no idea where to look next. Also, we have enough memory on these servers and are not running out.
Any ides what this could be?
Thanks,
Radu
Radu P.