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Trace and Log Files 
Log information
pertaining to Knowledge Management is stored by the system in the file
defaultTrace.trc. This file is stored in
the directory .../j2ee/cluster/server<n>/log. You use the
log viewer to
display and evaluate logged data.
You activate audit logging for ACLs by setting the required level of detail for the audit logging class com.sapportals.wcm.repository.security.SecurityAudit$Log in the visual administrator of the J2EE Engine.

com.sapportals.wcm.repository.security.SecurityAudit$Log
Severity = DEBUG