Drives mapped to a DFS root are disconnected when you try to open a file on that drive with a browser

Products

• Data Loss Prevention Core Package
• Data Loss Prevention
• Data Loss Prevention Endpoint Suite

Issue/Introduction

In DLP 16.0 RU1 drives mapped to a DFS root are disconnected when you try to open a file on that drive with a browser.

Steps to reproduce:

1. Open an XML or PDF file in Microsoft Edge or Chrome from the mapped drive
2. Observe the “BAD NETWORK PATH” error in the Process Monitor trace coming from the explorer.exe path

The issue does NOT occur if the drive is mapped to a DFS hostname, rather than the DFS Root. E.G.

• Failure: DFS Root (mapped to \\<DFS root>\<path>\
  • This failure occurs whether mapped manually via Explorer to the DFS root or via the AD Script to the DFS root
• Success: DFS Hostname (mapped to \\<hostname>\<path>\

Environment

DLP 16.0 RU1

Cause

The issue was isolated down to browser channel monitoring.
If Edge HTTPS is on, it will fail to load in Edge.
If Chrome HTTPS is on, it fails to load in Chrome.

Resolution

This has been corrected in hotfix 16.0 RU1 HF7.

If you need this fix, open a case with Support to request the fix and provide this KB number.