1633383 - "Logon credentials for this request are missing. Without these credentials the report is not viewable"

While opening a report, when the user leaves a session idle for 5-10 mins, he gets:

 "Logon credentials for this request are missing. Without these credentials the report is not viewable. Please enter the name of APS that hosts your account, and your username and password" along with a Logon Window containing the text box for username, an entry of 'CMS Port number' and authentication type.

• SAP BusinessObjects Enterprise XI 3.1
• Tomcat 5.5

Logon credentials, report is not viewable, , KBA , BI-BIP-ADM , BI Servers, security, Crystal Reports in Launchpad , Problem