SBS2008, Companyweb gives 404 pages at all workstations intermittently, may last 15-40 minutes, then starts working again. Event logs shows error EventId 3355; Cannot connect to SQL Server. np:\\.\pipe\MSSQL$Microsoft##SSEE\sql\query not found. Additional error information from SQL Server is included below. These seem to be preceded by EventID 3760; SQL Database 'ShareWebDb' on SQL Server instance 'np:\\.\pipe\MSSQL$Microsoft##SSEE\sql\query' not found. Additional error information from SQL Server is included below. The errors coincide with the 404 page errors, and the 3355 error comes up every 5 minutes until it goes away on it's own.

Hi thomaspc, From your description of this issue, it seems that there is something wrong with the access to your Database. Event 3355 may be caused by one or more of the following reasons: 1. The SQL Server user login failed. 2. The SharePoint database access account might not have the necessary permissions to communicate with the SQL Server. 3. A firewall that runs on either the local server or on SQL Server might be blocking network communications. You can refer to the following two articles to get more detailed information about this and try the solutions there: http://technet.microsoft.com/en-us/library/cc561047(office.12).aspx; http://technet.microsoft.com/en-us/library/ee513066.aspx. Event 3760 may be caused by one or more of the following reasons: 1. The SQL Server user login failed. 2. The database has been deleted or renamed. 3. The database is currently unavailable because it is in an offline or loading state. You can refer to the following two articles to get more detailed information about this and try the solutions there: http://technet.microsoft.com/en-us/library/cc561036(office.12).aspx; http://technet.microsoft.com/en-us/library/ee513043.aspx. Although some of the articles above is about SharePoint 2010, I think they are still helpful to SharePoint 2007. Thanks & Regards, Peng Lei