MSSQLSvc/myServer\INT:1433
MSSQLSvc/myServer.myDomain.local\INT:1433
Is this considered as duplicated SPN that I need to delete one?
A NetBIOS name entry and a FQDN entry are not considered duplicates.
If you are creating the linked server from the SQL Server 2005 side I would check the SPNs for that one and ensure it and delegation are setup correctly, since it is the one delegating your login to the SQL Server 2012 instance.
Joie Andrew
"Since 1982"