For a minute I thought the error is related to network as it refers 'RequireKerberos' and 'SQL Network name', on top of that this is a SQL Server 2008 Failover clustering environment. Both of these terms are registry based values that...
SQLServer-QA.net - Knowledge Sharing Network (SSQA.net)
Thu, Dec 16 2010
Filed under: Filed under: sql server, kba, best practices, cluster, installation, instances, kerberos, slipstream, merge drop, network name, failover clustering