Microsoft KB Archive Search

Notice: This website is an unofficial Microsoft Knowledge Base (hereinafter KB) archive and is intended to provide a reliable access to deleted content from Microsoft KB. All KB articles are owned by Microsoft Corporation. Read full disclaimer for more details.

  1. Home
  2. Slow network or replication issues after you change the number of virus scanning API threads in Microsoft Exchange Server 2010

Slow network or replication issues after you change the number of virus scanning API threads in Microsoft Exchange Server 2010

Symptoms

Consider the following scenario:
  • You run the Exchange Server Analyzer tool on a server that has Microsoft Exchange Server 2010 installed.
  • The Exchange Server analyzer tool reports the following warning message:
    Warning Virus scanning API (VSAPI) low thread count Server server name. The number of virus scanning API threads on server server name is too low and may cause performance degradation. Current number of threads: number. Based on the current hardware configuration, a value of number is recommended.
  • You change the number of virus scanning API threads to the recommended number from the Exchange Server Analyzer tool on the computer.
In this scenario, the network performs slowly on the Exchange server, or replication issues occur on the Exchange server.

↑ Back to the top

Cause

This issue occurs because the Exchange Server Analyzer tool uses an incorrect method to calculate the recommended number of virus scanning API threads. Therefore, the tool suggests a much larger number than the number that is suggested by the antivirus scanner company.

↑ Back to the top

Resolution

To resolve this issue, install the following update rollup:
2582113 Description of Update Rollup 5 for Exchange Server 2010 Service Pack 1
Note This hotfix removes the incorrect ScanningThreads rule from the Exchange Server Analyzer tool.

↑ Back to the top

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

↑ Back to the top

More Information

For more information about the Exchange Virus Scanning API, visit the following Microsoft TechNet website:
General information about the Exchange Virus Scanning API

For more information about the Exchange Server Analyzer tool, visit the following Microsoft TechNet website:
General information about the Exchange Server Analyzer tool

↑ Back to the top

Keywords: kbfix, kbexpertiseinter, kbexpertiseadvanced, kbsurveynew, kb

↑ Back to the top

Article Info
Article ID : 2529715
Revision : 2
Created on : 9/26/2018
Published on : 9/26/2018
Exists online : False
Views : 272