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Microsoft, SBS 2011, Service Pack 1, Service Pack 1, Service Pack 1, Service Pack 1, Small Business Server 2011, Windows, Windows 7, Windows Server 2008 R2

Umpo.dll – Pre Service Pack 2 Revision History for Windows Server 2008 R2 SP1, Windows 7 SP1 and Windows Small Business Server 2011 (SBS 2011)

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Umpo.dll – Pre Service Pack 2 Revision History for Windows Server 2008 R2 SP1, Windows 7 SP1 and Windows Small Business Server 2011 (SBS 2011)

03-Nov-2011 – 6.1.7601.21853 – Umpo.dll – x86/x64 – http://support.microsoft.com/kb/2639077 – Handle leak in Svchost.exe when a WMI query is triggered by using the Win32_PowerSettingCapabilities class in Windows 7 or in Windows Server 2008 R2

26-Jul-2011 – 6.1.7601.21778 – Umpo.dll – x86/x64 – http://support.microsoft.com/kb/2582112 – Windows 7 or Windows Server 2008 R2 stops responding when an application performs many I/O operations to a network share

14-Jan-2011 – 6.1.7601.21641 – Umpo.dll – x86/x64 – http://support.microsoft.com/kb/2397190 – The brightness setting for the display in the “Plugged in” profile is changed after you restart a Windows 7-based portable computer that is running on battery power

11.4.2, 11.4.2, 11.4.2, 11.4.2, 11.4.2, 11.4.2, 11.4.2, 11.4.2, 11.4.2, 11.4.2, 11.5.1, 11.5.1, 11.5.1, 11.5.1, 11.5.1, 11.5.1, 11.5.1, 11.5.1, 11.5.1, 11.5.1, 11.5.1, 11.5.2, 11.5.2, 11.5.2, 11.5.2, 21, 22, 23, 330, 505, 510, 520, 530, 810, 820, 830, Cisco, CSP1, CSP1, CSP1, CSP1, CSP1, CSP1, CSP1, CSP1, CSP1, CSP1, CSP1, CSP1, CSP1, CSP1, CSP2, CSP2, CSP2, CSP2, CSP2, CSP2, CSP2, CSP2, CSP2, CSP2, CSP2, CSP2, CSP2, CSP2, CSP3, CSP3, CSP3, CSP3, CSP3, CSP3, CSP3, CSP3, CSP3, CSP3, CSP3, CSP3, CSP3, CSP3, CSP4, CSP4, CSP4, CSP5, CSP5, CSP5, CSP5, CSP5, CSP5, CSP5, CSP6, CSP6, CSP6, CSP6, CSP6, CSP6, CSP6, CSP7, CSP7, CSP7, CSP7, CSP7, CSP7, CSP7, CSP8, CSP8, CSP8, CSP8, CSP8, CSP8, CSP8, CSP9, CSP9, CSP9, CSP9, CSP9, CSP9, CSP9, CSP9, CSP9, CSP9, Microsoft, SBS 2008, SBS 2011, Service Pack 1, Service Pack 1, Service Pack 1, Service Pack 1, Service Pack 1, Service Pack 1, Service Pack 1, Service Pack 1, Service Pack 2, Service Pack 2, Service Pack 2, Service Pack 2, Small Business Server 2008, Small Business Server 2011, Watchguard, Windows, Windows 7, Windows Server 2008, Windows Server 2008 R2, Windows Vista, XTM

HTTP and HTTPS requests or traffic to a Windows Vista, Windows 7, Windows Server 2008, SBS 2008, Windows Server 2008 R2 or SBS 2011 machine may exhibit increased latency if the connection is through a network load balancer

If you utilise Microsoft Internet Information Services IIS or an application that uses the System.Net.HttpListener class is installed or running on one the operating systems below, and you have a Network Load Balancer then you may find that Increased latency occurs on HTTP and HTTPS requests and traffic.

This issue occurs because the HTTP and HTTPS requests from clients can include zero length data in the SSL records, certain server-side variables do not update correctly in this instance and Http.sys leaves the connection in the CLOSE_WAIT state.  This intern exhausts the open connection limit can introduce latency, timeouts and connection problems.

Affected Operating Systems:

Microsoft Windows Vista

Microsoft Windows 7

Microsoft Windows Server 2008

Microsoft Small Business Server 2008 – SBS 2008

Microsoft Windows Server 2008 R2

Microsoft Small Business Server 2011 – SBS 2011

The Microsoft Knowledge Base Article KB 2634328 includes further information on this issue and provides an updated version of Http.sys that corrects the issue http://support.microsoft.com/kb/2634328