While upgrading from previous SQL Server versions (2005, 2008 or 2008 R2) to new SQL Server 2012, during setup, you might encounter the following error:
"Failed to copy registry settings for SQL Server Network Interfaces from machine 'Cluster Node X' to machine 'LocalMachine'. Error 11004"
When you look up error "11004" you will find that it indicates a problem in the reverse DNS settings. To be more specific, at the command prompt...
ping 'My SQL Service Name' --> ip is: xxx.xxxx.xxxx.xxx
nslookup xxx.xxx.xxx.xxx --> name is: 'Another unmatched Name'
This may happen if this IP was previously assigned to another service or machine name and your DNS has problems replicating data between DNS Servers.
If you encounter this problem, it is advisable that you do not press 'Cancel'. Fix the DNS issue and ensure that the machine on which the setup is running can read correct DNS settings then 'retry'.