For each WS-Trust authentication failure, debug logs are generated resulting is consumption of additional log space and the log contains the following error:
com.sun.xml.ws.security.opt.impl.incoming.UsernameTokenHeader validateSEVERE: WSS1408: UsernameToken Authentication Failed
Workaround: To suppress the debug logs printed for any WS-Trust authentication failure, add com.sun.xml.wss.level=OFF to the /opt/novell/nam/idp/conf/logging.properties file and restart the IDP server.