App Control "A transport-level error has occurred" During Server Upgrade

Products

• Carbon Black App Control (formerly Cb Protection)

Issue/Introduction

When attempting to upgrade the server to a newer version, the upgrade fails.  Review of the logs shows this error message

• A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The specified network name is no longer available.)

Environment

• App Control Server: All Supported Versions
• Microsoft SQL Server: All Supported Versions

Cause

• Network settings may have changed since initial deployment
• Server may be in a DMZ

Resolution

• Correct network settings ensuring uninterrupted communication between the App Control Server and the Microsoft SQL Server
• If necessary, move the server out of the DMZ in order to perform the upgrade.