When I try to add the server to the farm, I get to the part after you retrive the database names.
That works no issue and find the right DB name.
After clicking next I get the following message
"Failed to connect to the existing server farm located at the
specified database name. The database name is not a valid configuration
database"
I see this in the Event Log
A network-related or instance-specific error occurred while establishing
a connection to SQL Server. The server was not found or was not
accessible. Verify that the instance name is correct and that SQL Server
is configured to allow remote connections.
(provider: SQL Network Interfaces, error: 28 - Server doesn't support
requested protocol)