Tag Archives: Requests

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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 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, Service Pack 3, Service Pack 3, Small Business Server 2008, Small Business Server 2011, Windows, Windows 2000, Windows 7, Windows Server 2003, Windows Server 2003 R2, Windows Server 2008, Windows Server 2008 R2, Windows Vista, Windows XP, XP Mode

Microsoft Windows Server 2008 and Microsoft Windows Server 2008 R2 DNS Server may stop responding to DNS queries and requests from client computers

Microsoft Windows Server 2008 and Microsoft Windows Server 2008 R2 DNS Server may stop responding to DNS queries and requests from client computers, this issue may occur randomly and when it is occuring the DNS Server stops responding.

This issue occurs because the DNS Server goes into an infinite loop, more information about this issue and a hotfix to address the issue is provided in Microsoft KB 2655960 http://support.microsoft.com/kb/2655960