Custom Attributes fail after upgrading Data Insight from 3.0 to 6.1

Products

• Data Loss Prevention Enforce
• Data Insight for DLP

Issue/Introduction

Data Loss Prevention (DLP) 14.6 MP2 was upgraded to DLP 15.1.
The previous version of Veritas Data Insight (DI), 3.0, is not compatible with DLP 15.1.
After upgrading DI to 6.1.0 the previously working custom attributes fail to load.

In System > Incident Data > Lookup Plugins, the Match AD for Attributes plugin shows a status of "Failed".

Environment

DLP 15.1 
Data Insight 6.1.x

Resolution

Had to reinstall the SSL certificate on the Enforce server.