Tag Archives: Service

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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

Microsoft, SBS 2011, Small Business Server 2011, Windows, Windows 7, Windows Server 2008 R2

Windows 7, Server 2008 R2 and SBS 2011 RTM or SP1 – svchost.exe may hold a lock on a service and cause slow Windows startup

You may find that svchost.exe holds a lock on a service whilst all the service libraries are being loaded.  This in turn then prevents any other services in the same instance of svchost.exe from starting up until the call to the function has been returned.

An updated version of svchost.exe that will address the issue is available here http://support.microsoft.com/kb/2510636