Application Error "Memory could not be written"

Technical Articles ID: KB87965
Last Modified: 2/5/2021

Environment

McAfee Data Loss Prevention (DLP) Endpoint - all supported versions
McAfee ePolicy Orchestrator (ePO) 5.x

Microsoft Windows 10 Version 1511 or later
Microsoft Internet Explorer 11

For supported platforms, see KB68147 - Supported platforms for Data Loss Prevention Endpoint.

Problem

On a client with the DLP Endpoint Clipboard Protection or Printing Protection rules applied, you see the following error message when you use Internet Explorer 11:

Application Error : The instruction at 0x00007FFB76534F20 referenced memory at 0x00007FFB76534F20. The memory could not be written.
Click on OK to terminate the program

NOTE: This issue occurs on clients that run Windows 10 Version 1511 or later using Internet Explorer 11. The issue does not occur when the Clipboard Protection and Printing Protection rules are disabled on the client. The issue also does not occur if Internet Explorer 11 is downgraded to a previous version.

Cause

The default clipboard allow list process, fontdrvhost.exe, was removed from the DLP Endpoint Clipboard Protection rule.

Solution

Add the fontdrvhost.exe process to the DLP Endpoint Clipboard Protection rule:

Log on to the ePO console and go to Menu, Policy Catalog, Windows Client Configuration.
In the left pane, select the Clipboard Protection rule.
In the right pane, type fontdrvhost.exe in the process name field and click Add to add the process.
Save the change.
In the System Tree, select the client.
To force a policy and task update on the client, perform a wake-up call.

If a printing rule is assigned within the same rule set, add the fontdrvhost.exe process to the DLP Endpoint Printing Protection rule:

Log on to the ePO console and go to Menu, Policy Catalog, Windows Client Configuration.
In the left pane, select the Printing Protection rule.
In the right pane, type fontdrvhost.exe in the process name field and click Add to add the process.
Save the change.
In the System Tree, select the client.
To force a policy and task update on the client, perform a wake-up call.

Affected Products

Data Loss Prevention Endpoint 11.6.x
Data Loss Prevention Endpoint 11.5.x
Data Loss Prevention Endpoint 11.4.x
Data Loss Prevention Endpoint 11.3.x
Troubleshooting

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Application Error "Memory could not be written"

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Application Error "Memory could not be written"

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