SQL Server Reporting Services Error

The report server cannot decrypt the symmetric key that is used to access sensitive or encrypted data in a report server database. You must either restore a backup key or delete all encrypted content. (rsReportServerDisabled) Get Online Help
Bad Data. (Exception from HRESULT: 0x80090005)

Solution

Possible reasons would be either the account for running the SSRS 2008 has been changed or port number has been changed. To fix the above error,

a) Logon to the Reporting Services Configuration Manager.
b) Make a note of the settings in all the sections.
c) Click the Encryption Keys section.
d) Click the "Delete" button to delete encrypted content.
e) Check whether all the settings in all the sections are intact and also make necessary changes.
f) Click the "Change" button to replace the encrypted content with the updated changes.