The Websphere protal 6.1 was logging normally
[WAS_HOME]\profiles[PROFILE_NAME]\logs[SERVER_NAME]\
But when I tried to clear the content of the log file to clear old logs, WebSphere log to this file anymore and the file is always blank, knowing that i cleared the content of the old log file and didn't remove the the file itself so i don't think it would be a permission problem.
Thanks
Yehia