title: How to resolve RS error "This may be due to a connection failure, timeout or low disk condition within the database."?
body: <p>After migrating the ReportServer database from 2014 to 2019 SQL Server Standard, I ran the Report Server Configuration Manager (on the same box as the SQL Server), Database --&gt; Change Database --&gt; Choose an existing report server database --&gt; select the ReportServerTest from the drop down list using LocalSystem as Username and Authentication Type is set to Service Credentials. The Service Account is set to LocalSystem. The NT AUTHORITY\SYSTEM and NT SERVICE\SQLServerReportingServices are both DB_Owner of the ReportServerTest and ReportServerTesTempDB databases. These two accounts is also in the Local Administrator's group. However, I keep getting the following error when access the Web Service URL.</p>
  <p>An error occurred within the report server database. This may be due to a connection failure, timeout or low disk condition within the database. (rsReportServerDatabaseError) Get Online Help
  Execution Timeout Expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
  The wait operation timed out</p>
  <p>I can create a new database and it works fine. However, this error only shows up when I selected the existing ReportServer Database that I restored it from the 2014 SQL Server Enterprise Edition. I've looked at this <a href="https://stackoverflow.com/questions/5753453/cannot-open-a-connection-to-the-report-server-database/21501573">thread</a> but it does not work in my situation.</p>