I found the issue. Was missing the class wms-plugin-security.jar in folder lib. I placed it there and worked. In log was showing:
2013-10-03 12:23:50 UTC comment server WARN 200 - loadModFunctions[asaweb/definst]: Module class not found or could not be loaded. Check [install-dir]/conf/asaweb/Application.xml to be sure all Modules/Module/Class paths are correct: name:ModuleRTMPAuthenticate class:com.wowza.wms.plugin.security.ModuleRTMPAuthenticate - - - 230.838 - - - - - - - - - - - - - - - - - - - - - - - - -
NOw was saved and working correctly.
Thanks
For your help
Pedro