In the Cognos 8.4 distribution some diagnostic tools are default installed in the directory <cognosinstalldir>\bin\utilities\diagnostictools\win32. One of them is "IBM Cognos 8 Diagnostic". These tools were earlier available on the support site of Cognos.Cognos 8 Diagnostic will retrieve system and product information about IBM Cognos 8 environment.
Just execute the file "execute_IBMCognos8.bat" or java -jar IBMCognos8.jar from the DOS prompt. Or execute the file "execute_IBMCognos8.bat" from windows explorer window.
A lot of useful information is collected like: logs, processes, email settings, print settings, ldap settings, Cognos configuration settings extracted from the cogstartup.xml etc.