"Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. (Microsoft SQL Server, Error: -2)"

In SQL Server Management Studio this error appears as:

"Cannot connect to ."

"Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. (Microsoft SQL Server, Error: -2)"

From sqlcmd, possible timeout errors include:

"SQL Network Interfaces: Error Locating Server/Instance Specified"

"Sqlcmd: Error: Microsoft SQL Server Native Client : Client unable to establish connection."

"Sqlcmd: Error: Microsoft SQL Server Native Client : Login timeout expired."

"Could not open a connection to SQL Server"

"An error has occurred while establishing a connection to the server. When connecting to SQL Server, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections."

resolution link:
============================
http://msdn.microsoft.com/en-us/library/ms190181.aspx