Error occurs when you upgrade Search from Ektron 8.60 to 9.00

When you upgrade Search from Ektron 8.60 to 9.00, the following error occurs when EktronSearchConfiguration.exe tries to register the site:  Warning! The current user domain: can't authenticate against the domain: '(domain name)'. If you wish to use a user on the 'dom1' domain then please login as a user on that domain.

When you run the 8.60 installation EktronSearchConfiguration.exe on the same machine using the same domain account, it installs correctly and all functionality is present.

Solution: Install server .NET Framework 4.5

After .NET 4.5 is installed, the site registration process works without incident.