The FogBugz database is down or could not be found.

For security reasons, this cannot be fixed over the web.

Please edit the registry on the FogBugz server. The setting you want is HKEY_LOCAL_MACHINE\SOFTWARE\Fog Creek Software\FogBugz\C:/Program Files/FogBugz/website/pages\sConnectionString.
Common connection strings can be found at connectionstrings.com. (Also please note that if your SQL machine is on a different server than your web server, you may have to use SQL Server Authentication, and not Integrated Authentication.)

To use SQL Server, set this to Provider=sqloledb;Data Source=server;Initial Catalog=database;Integrated Security=SSPI; for Integrated Authentication
or Provider=sqloledb;Data Source=server;Initial Catalog=database;User Id=sqlserveruser;Password=sqlserverpassword; for SQL Server Authentication

To use Access, set this to Provider=Microsoft.Jet.OLEDB.4.0;Data Source=filename

Or, you can always use an ODBC data source name, which you establish using the Data Sources (ODBC) control panel.

Error: -2146232009: ERROR [IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified