Tag Archives: Netbios.sys

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

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

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

08-Mar-2012 – 6.1.7601.21938 – Netbios.sys – x64 – http://support.microsoft.com/kb/2668395 – 32-bit NetBIOS-based application stops responding in an x64-based version of Windows 7 or of Windows Server 2008 R2

08-Mar-2012 – 6.1.7601.17792 – Netbios.sys – x64 – http://support.microsoft.com/kb/2668395 – 32-bit NetBIOS-based application stops responding in an x64-based version of Windows 7 or of Windows Server 2008 R2

24-Nov-2011 – 6.1.7601.21866 – Netbios.sys – x64 – http://support.microsoft.com/kb/2633667 – 32-bit NetBIOS applications cannot receive connection close notifications in a 64-bit version of Windows 7 or in Windows Server 2008 R2

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

32 Bit Applications that utilise NetBIOS API do not receive connection close notifications in Windows 7 64 Bit Edition, Windows Server 2008 R2 or Windows Small Business Server 2011

32 bit applications that utilise NetBIOS API do not receive connection close notifications in Windows 7 64 Bit Edition, Windows Server 2008 R2 or Windows Small Business Server 2011 and as a result they do not try to re-establish a session.  Restarting the application will re-establish the session and recover from the issue.

This issue occurs because when the Netbios.sys driver receives data the driver does not convert the Network Connection Block NCB structure from 64 bit to 32 bit when the session has been dropped.  A 32 bit application cannot understand the 64 bit NCB structure which is why the session cannot be re-established.

The Microsoft Knowledgebase article KB 2633667 provides further information on the issue and a Hotfix containing an updated version of the Netbios.sys driver that that corrects this particular issue http://support.microsoft.com/kb/2633667