http://blogs.msdn.com/alimaz/archive/2008/03/04/error-10039-on-nlb-wfe-servers.aspxIssue: In NLB unicast mode Network card's MAC address gets replaced by a virtual MAC which prevents the servers from connecting to each other if only one network card is installed on WFE/Query machines . By default WFE may reroute the search request toen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/alimaz/archive/2008/03/04/error-10039-on-nlb-wfe-servers.aspx#8684189Thu, 03 Jul 2008 16:40:03 GMT91d46819-8472-40ad-a661-2c78acb4018c:8684189GLetellier<P>I Have the same problem but I don't understand the solution. Can you please detail "Adding a second Network card should resolve this issue" ?</P> <P>Thank you in advance, </P>