I've been using the YQL geo.placefinder table to geocode addresses. Recently I've noticed some the geocoder does not return results intermittently. Looking at the logs shows an HTTP 418 unused error. I would expect to see a "999" error if we were passed the rate limit. Any ideas what could be going on?
This clearly is not a YQL issue since Ross is directly using the Placefinder API and is running into the same 418 error. The Placefinder table runs on top of the Placefinder API so if the underlying API does not work correctly neither will the table.
You'll need to address your concerns to the BOSS team since this is outside the scope of YQL. However, I do want to mention that BOSS does state they no longer actively support the free APIs and encourage using BOSS Geo instead: