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The <glassfish root>/domains/domain1/config/amflatfiledir/AMConfig.properties files installed as part of NB 6.0 M10 configuration does contain com.iplanet.am.cookie.encode=false This is rather unusual and cause users to not being able to authenticate with Access Manager as soon as the session cookie contains special chars. Access Manager ships with this property set to true by default.
File a corresponding bug in bugster, 6591248 against AM.
This is an AM bug and is not related to tooling. I am closing this bug as wontfix.