We are seeing 420 errors on our account right now, today. We have not seen them hardly at all before... We have a pause in our search cycle with Twitter that has been sufficient to not cause us to exceed our whitelist allocation. Have you revised downward the whitelist limits in general or for us in particular? We have been using this api for more than 18months without much problem.
Our production app is using basic auth: is that a factor? (We are going to switch to oauth later today). This change of behavior is impactng our business. @JeffGreenberg jeffrey greenberg tweettronics.com