I am using Apigee as an API proxy. I have 2-way ssl set up for the connection between Apigee and my backend server. I am getting an intermittent response code of CLASSIFICATION_FAILED from Apigee proxy (HTTP status code of 404), and the other times Apigee successfully forwards the requests to my backend server. When I have trace turned on for the API, and when I get the CLASSIFICATION_FAILED error, Apigee trace does not even record the transaction for the erroneous request. We have this API working for months. This problem only came up recently. Does anyone have an idea of what causes this?