Hello
**Environment**
Two Node Windows Failover cluster
Windows Server 2008R2 SP1
SQL Server 2005 SP4
SQL Server 2008R2 SP1
![alt text][1]
**Issue**
Red Gate SQL Backup fails when executed from a SQL Agent job or via query in SSMS, this only happens when the SQL Server instance is hosted on Server A but works fine on Server B. The Error that is being returned is as follows;
SQL error -1: SQL Network Interfaces: Error Locating Server/Instance Specified [xFFFFFFFF]. Server : Server A\SQL01 Windows authentication 04/10/2012 17:13:12: Failed to connect to SQL Server instance: Server A\SQL01Another observation made when testing connectivity to the SQL 2005 Instances using the Surface Area configuration tool, was that when directed to a specific cluster name such as ClSvr01 it would return the instance name of SQL02 which is not present within ClSvr01. This would be the case for all instances that I tried to connect to while on Server A, performing the same actions from Server B worked as would be expected. By disabling Named Pipes for the specified instance and this seems to have resolved the issue with the Surface Area Configuration tool but not the backup software. Connection to all instances via SSMS using TCP/IP or Named Pipes is fine, and running queries such as SERVERPROPERTY and @@SERVERNAME return the results I would expect to see with regards to the server knowing who it is. There are no entries in the host files or anything like that. I am unable to replicate this issue within any of my testing VM systems so am not 100% sure where else to look. **Question** Can anyone think of why I might be getting the incorrect resolution of Server & instance names on one server and not the other, I am almost certain that it is a configuration issue outside of SQL Server but I cannot think where to look. Any assistance would be very much apprecaited in where/what to look for, or if anyone has had a similar issue. Many thanks John [1]: http://www.gliffy.com/pubdoc/3932742/L.png