Category Archives: Cisco

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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

Cisco, Microsoft, SBS 2003, SBS 2008, SBS 2011, Small Business Server 2003, Small Business Server 2008, Small Business Server 2011, Windows, Windows 7, Windows Server 2003, Windows Server 2003 R2, Windows Server 2008, Windows Server 2008 R2, Windows Vista, Windows XP

A Windows Based Computer that is connected to your network via an IP Phone (NAP-Enabled) may not connect to the same VLAN after resume from hibernation

This issue applies to Windows XP – SP3, Windows Vista – SP2, Windows Server 2008 – SP2, Windows Server 2008 R2 – SP1 and Windows 7 – SP1.

This issue occurs on networks that use IEEE 802.1X authentication where the client computer or server machine is connected or bridged via a NAP-Enabled device such as an IP or VoIP Phone Handset.

The issue will not be resolved for Windows XP because it is now outside the mainstream support cycle.  Hotfixes for the other operating systems listed above can be obtain via Microsoft KB 976373 http://support.microsoft.com/kb/976373