Logged onto farm CA server, and then executed the following commandlet to move all site collections in one database to another:
Get-SPSite -ContentDatabase [SourceDatabaseID] | Move-SPSite -DestinationDatabase [DestinationDatabaseID]followed by an IISRESET. Then tried connecting to the site again to verify that it is operational. On connecting, experienced a 403 Forbidden error presented in the browser.
- Execute IISRESET on the farm server hosting the content web application.