http://msdn.microsoft.com/en-us/library/ms178068%28v=sql.105%29.aspx
To use in SSMS please follow up those steps.
1. Enable SQL Server Browser.
Many of case for Network-Related error message is due to this reason.
2. Please use “Database Engine Query“, File>New> Database Engine query
This is keyword.
Do not open using object explorer since DAC does NOT support multiple sessions.
3. Add “ADMIN:” in front of server name
ADMIN:localhost
Simon's SQL 