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Displaying a leap second message can cause the EWS/MEG 7 Appliance kernel to stop responding (leap second message hangs the kernel)
Technical Articles ID:  KB75268
Last Modified:  10/10/2013
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Environment

McAfee Email and Web Security Appliance 5.6
McAfee Email and Web Security Appliance 5.5
McAfee Email Gateway 7.0

Network Time Protocol (NTP) enabled

Problem

McAfee has discovered an issue with the Linux Kernel in versions prior to 2.6.29. Displaying a leap second message can cause the kernel to stop responding when the kernel attempts to print a message when a leap second is inserted or removed: 

When will the fix discussed in these threads be implemented in the EWS/MEG 7 Appliance software?

Solution 1

Email and Web Security 5.6:

This issue is resolved in Email and Web Security 5.6 Patch 4, which is available from the McAfee Downloads site at: http://mcafee.com/us/downloads/downloads.aspx. For instructions on how to download patches, see KB56057.

Patches are cumulative, therefore McAfee recommends that you install the latest one.

To review the Release Notes for this patch, see PD23876.



NOTE: If you are an EWS 5.5 user, you have to upgrade to EWS 5.6 and then apply Patch 4 or newer to resolve this issue. For further information on upgrading from 5.5 to 5.6, see KB70754.

Solution 2

McAfee Email Gateway 7.0:

This issue is resolved in Email Gateway 7.0.2, which is available by logging in to the ServicePortal at: https://support.mcafee.com/downloads.
 
Patches are cumulative; therefore, McAfee recommends that you install the latest one.  

To review the Release Notes for this patch, see PD24053.
To review Known Issues, see KB75327.

Workaround

On June 30, 2012, a positive leap second was introduced to Coordinated Universal Time (UTC).

If you cannot apply the patch before that date, use the following workaround to adjust the time from the NTP server:

  1. Before the leap second happens, log on to the Appliance Management Console.
  2. Navigate to System, Appliance Management, Time and Date, System Time.
  3. Deselect Enable NTP and Apply the configuration changes.
  4. After the leap second has been introduced, log on to the Appliance Management Console again.
  5. Navigate to System, Appliance Management, Time and Date, System Time.
  6. Check Enable NTP and Apply the configuration changes.

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