MonitorController won't stay up after enabling Cloud Proxy Settings for Cloud Detection Service

Products

• Data Loss Prevention Cloud Service for Email
• Data Loss Prevention Cloud Detection Service
• Data Loss Prevention Cloud Package

Issue/Introduction

In Enforce, after adding a proxy address to the Cloud Proxy Settings field (in System > Settings > General), the DetectionServerController (aka MonitorController in v15.0 and earlier) will not stay running.

Environment

Enforce 15.x, 16.x, all versions with Cloud Detection or Cloud Email services

Cause

There's no sanity checking in this field, but you should not include the protocol prefix as part of the proxy address - including the "http" breaks the connections MonitorController is making outbound from Enforce, including to the Oracle database.

Resolution

Delete "http://" from the proxy URL if present, and recycle the DetectionServerController (aka MonitorController).