jira.websudo.is.disabled = true doesn't work

I've managed to reproduce the problem using Jira4.4.1 standalone zip version
Just unpacked, added home folder in jira-app.properies, created your jira-config.properties file and put :

jira.websudo.is.disabled = true 

in it as requested by http://confluence.atlassian.com/display/JIRA/Configuring+Secure+Administrator+Sessions

but the admin login screen appears always