How can I cancel/re-execute configuration task on NWA 7.3 which has "Currently executing" status?

 This may happen if your web session has expired during execution of configuration task which was not able to finish in the background because it needed some user input/response. The next time you login to Configuration Wizard if the server is not restarted you will see this task with "Currently executing" status which prevents you from re-executing the task. The status can be cleared by restarting the "tc~lm~ctc~cul~startup_app" application. To do this go to
http://:/nwa -> Operation Management -> Systems -> Start & Stop -> Java EE Applications
Then stop and start the application.
Reference: http://naidukyalla.blogspot.pt/2010_07_01_archive.html