Got this error when I was trying to configure SQL Server Reporting Services 2005 on Windows Server 2008:
ReportServicesConfigUI.WMIProvider.WMIProviderException: The report server cannot open a connection to the report server database. A connection to the database is required for all requests and processing. (rsReportServerDatabaseUnavailable)
at ReportServicesConfigUI.WMIProvider.RSReportServerAdmin.ThrowOnError (ManagementBaseObject mo)
at ReportServicesConfigUI.WMIProvider.RSReportServerAdmin.ListReportServersInDatabase (RSReportServerInfo[]& serverInfos)
Turns out I really just needed to restart the Windows Management Instrumentation Service:
1. Start > Run > services.msc
2. Right click on Windows Management Instrumentation, and restart.