Recently I was installing SharePoint 2010 and the
Configuration wizard failed giving me the below error
Failed to create the configuration database.
An exception of type System.ArgumentException was
thrown. Additional exception information: [Server Name or IP Address], [Port]
is an invalid or loopback access. Specify a valid server address.
We had a hardened environment where only a specific SQL
port was made available.
On the Specify
Configuration Database Settings screen, I entered the Database server in
the below format (Database Server Name followed by a coma and the port number that was
made available)
Database
server: DATABASE-SERVERNAME,1581
Database name: SharePoint_Config_test
The fix
Enter in the below format(if there is only one instance
of SQL in the database server) (append '\MSSQLSERVER' after the Database Server Name followed by the coma and the port number)
Database
server: DATABASE-SERVERNAME\MSSQLSERVER,1581
Database name: SharePoint_Config_test