Having problems with remote access: SQL Server 2008 R2

345340 pts.
Tags:
Remote connectivity
SQL Server 2008 R2
I have configured my server with a static IP and installed SQL Server 2008 R2 with ITAPP. The following happens when I use the IP to access SQL Server: Client Machine:
sqlcmd -S XXX.XXX.XXX.XXX -U sa -P mypass
A successful connection! But when I use:
sqlcmd -S XXX.XXX.XXX.XXXITAPP -U sa -P mypass

    HResult 0xFFFFFFFF, Level 16, State 1 SQL Network Interfaces: Error Locating Server/Instance Specified [xFFFFFFFF].

    Sqlcmd: Error: Microsoft SQL Native Client : An error has occurred while establishing a connection to the server.

    When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections..

    Sqlcmd: Error: Microsoft SQL Native Client : Login timeout expired.
Any help?

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