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Home > Success Center > Network Performance Monitor (NPM) > NPM - Knowledgebase Articles > Slow performance on Windows Server 2008, Windows Vista, and Windows 7

Slow performance on Windows Server 2008, Windows Vista, and Windows 7

Created by Interspire Import, last modified by MindTouch on Jun 23, 2016

Views: 1,996 Votes: 0 Revisions: 11


This article provides brief information and steps to resolve the issue when there is slow performance in Windows Server 2008, Vista and Windows 7.



All Orion Core products using Windows Server 2008, Windows 7 or Windows Vista


If Orion is installed on Windows Server 2008 or Windows Vista and there are any devices on your network, between your Orion server and your database server, that do not support RFC 1323, “TCP Extensions for High Performance”, the TCP window size auto-tuning feature of Windows Server 2008, Windows Vista, and Windows 7 may prevent your Orion server from successfully connecting with your Orion database. This TCP auto-tuning feature is intended as a network-sensitive restriction, applied by the receiver—your Orion server—on the amount of data it is allowed or able to receive. If any devices along the network path between your Orion server and your Orion database do not support the TCP window scaling detailed in RFC 1323, the allowed size of the TCP window in packets sent to your Orion server may not match the TCP window size reported by packets sent from your Orion server. This mismatch may lead to failed connections between your Orion server and your Orion database. The following procedure disables this TCP auto-tuning feature, resetting the TCP receive window to 64kB.


Note: SolarWinds only supports evaluation installations of Orion on Windows 7 and Windows Vista.

To disable tcp auto-tuning:

  1. Click Start > All Programs > Accessories.
  2. Right-click Command Prompt, and then click Run as administrator.
  3. If you are prompted by User Account Control, click Continue to open the elevated command prompt.
    Note: In some cases, having User Account Control (UAC) enabled on Windows Server 2008 and Windows Vista (evaluation-only) can lead to installation errors. For more information about disabling UAC, see the article, “Disabling User Account Control (UAC)” in the SolarWinds Knowledge Base.
  4. At the prompt, enter the following:
    netsh interface tcp set global autotuninglevel=disabled
  5. Close the command prompt window, and then restart your Orion server.
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