cannot connect to the configuration database

In sharepoint

Solution:

1. If the WSS is in a server farm, use the “SharePoint Products and Technologies Configuration Wizard” to disconnect the server from the farm.
2. go to Start >Program > Microsoft SQL Server 2005 > Configuration Tools >SQL Server Configuration Manager
3. Navigate to SQL Server 2005 Network Configuration > Protocol for MSSQLSERVER
4. Right click Named Pipes and select Enable (if not enabled)
5. Restart SQL Server
6. Join back the server to server farm using “SharePoint Products and Technologies Configuration Wizard” and follow the wizards.