Where netbeans stores subversion username/password ?

Hi all,

I am encountering problem while commiting files on my subversion repository: I get a HTTP Basic challenge
error message when commiting. Notice I can commit with other SVN client (SmartSVN). My problem is
netbeans don't ask me to reenter username/password. So I tried to remove .netbeans folder but netbeans
still does not ask me to enter  username/password.
So where subversion username and passwords are stored by netbeans ?

Regards,

Laurent.
NB: My OS is ubuntu.