How to stop and restart the congos server.
For Cognos 8, either go to Control Panel -> Services and restart the "IBM Cognos 8" service from there, or go to Start -> Programs -> IBM Cognos 8 -> Cognos -> IBM Cognos Configuration and use the restart button on the toolbar.
For Cognos 7, just go to Services as above, and stop and start all the relevant Cognos 7 services.
MF.