Symptoms
Consider the following scenario:
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You have a server that is running Microsoft Forefront Unified Access Gateway (UAG) 2010 in an array that uses Network Load Balancing (NLB).
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You try to install Forefront UAG Service Pack 1 Update 1 on the server.
In this scenario, when you select the array manager under Nodes in Array Monitor, the default application pool (DefaultAppPool) crashes.
Cause
This issue occurs because the Forefront UAG array expects a certain parameter response from the array nodes when the array is enabled in Array Monitor. When this issue occurs, a NULL pointer is passed as a parameter because of a problem in the logic, and an exception occurs.
Resolution
To resolve this issue, install the rollup package that is described in the following Microsoft Knowledge Base article:
2647899 Rollup 1 for Forefront Unified Access Gateway (UAG) 2010 Service Pack 1 Update 1
Workaround
To work around this issue, upgrade the array nodes to the same build as the array manager before you continue with the installation of Service Pack 1 Update 1 on the server.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
For more information about how to install Service Pack 1 Update 1, visit the following Microsoft TechNet website:
Installing SP1 Update 1 on an array using NLBFor more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
