After upgrading to SQL Server 2014, we encountered the following issue while configuring the Reporting Services:
When we tried to restore the Reporting Services Encryption key, it always failed. Inside the error logs we found the following information:
The version of the report server database is either in a format that is not valid, or it cannot be read. The found version is ‘163’. The expected version is ‘162’. (rsInvalidReportServerDatabase).
A quick search on the web brought us to the following post: https://blogs.msdn.microsoft.com/sql_server_team/upgrading-to-sql-2014-report-server-version-mismatch/
The problem can happen when you upgrade from a SQL 2012 SP2 server with CU5 or later, the database will have a higher version number than what SQL 2014 expects.
Luckily there was already a solution out there. I asked the server team to upgrade to SQL 2014 CU7 after which the issue was gone…