Full DAT package ZIP file is downloaded instead of incremental files

技術文章 ID: KB75051
上次修改： 6/1/2020

環境

McAfee DAT files
McAfee VirusScan Enterprise 8.8 with or without Patch 1

For VirusScan Enterprise (VSE) supported environments, see KB51111.

問題

Downloading the full DAT package as a ZIP file is expected if an incremental update fails. But, if the incremental update frequently fails because of the large file size of a full DAT package and bandwidth use, you have reason for concern.

The VirusScan Console (mcconsol.exe) does not open. If you monitor the Windows Task Manager, you see the mcconsol.exe process spawn, but it soon exits without ever displaying the console window.

原因

The following is known to cause VSE to download the full ZIP file unnecessarily, instead of the incremental files as expected:

Missing License Information data
During patch updates or product upgrades, or when using the Repair option, the installation logic to preserve settings sometimes causes the License Information data to be lost. The default location for this information in the Windows registry is: HKEY_LOCAL_MACHINE\Software\McAfee\DesktopProtection
The McShield Service does not load the new DAT file
This issue is also known as the mutual exclusion (mutex) issue. The McShield.exe process is running but does not load the updated DAT signatures. Instead, it continues to use the DAT files that are in memory.

The registry value AVDatVersion can be found in: HKEY_LOCAL_MACHINE\Software\McAfee\AVEngine

AVDatVersion indicates the DAT signature version that is in memory. The most recent Application Event log source McLogEvent with ID 5000 reports the same information. But, McAfee Agent records that the recent update attempt had succeeded. Despite a successful DAT update (the new signature files are installed on disk and are usable by the managed product), the new files have not yet been loaded into memory.
Insufficient disk space
The DAT signature file size has been growing in the past 12 months. If your computer has less than 1-GB free disk space, your DAT updates might fail.

解決方案

This issue is resolved in VSE 8.8 Patch 2 release, which is available from the Product Downloads site using a valid Grant Number.

NOTE: McAfee has modified the Update Script detection logic to identify when client systems are in this state and automatically restart the McShield Service.

Patches are cumulative. Technical Support recommends that you install the latest one.

VSE 8.8 Patch 14 is the latest patch available from the Downloads tab on the ServicePortal at https://support.mcafee.com/downloads.

NOTE: VSE 8.8 Patch 14 supports all supported Windows operating systems.

McAfee product software, upgrades, maintenance releases, and documentation are available from the Product Downloads site at: http://www.mcafee.com/us/downloads/downloads.aspx.

NOTE: You need a valid Grant Number for access. KB56057 provides additional information about the Product Downloads site, and alternate locations for some products.

解決方案

To resolve the Insufficient disk space issue
McAfee has released a specific statement to help you regarding minimum system requirements. For more information, see KB75027.

For details about supported environments, see KB51111.

因應措施

The McShield Service does not load the new DAT files
Restart your computer or restart the McShield Service.

NOTE: This workaround does not prevent the issue from occurring. To do so select a preventative solution above.

To restart McShield:

Disable the Prevent McAfee Services from being stopped option:
1. Click Start, Programs, McAfee, VirusScan Console.
2. Double-click Access Protection, and deselect Prevent McAfee Services from being stopped.
3. Click OK and exit the VirusScan Console.
Restart the McShield service:
1. Click Start, Run, type services.msc, and press Enter.
2. Locate and right-click the McAfee McShield service and click Restart.
Re-enable the Prevent McAfee Services from being stopped option:
1. Click Start, Programs, McAfee, VirusScan Console.
2. Double-click Access Protection, and select Prevent McAfee Services from being stopped.
3. Click OK and exit the VirusScan Console.

受影響的產品

VirusScan Enterprise 8.8

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Full DAT package ZIP file is downloaded instead of incremental files

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Full DAT package ZIP file is downloaded instead of incremental files

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