change weblogic user password if password lost

Hi,I need to change the password for user weblogic, because we don't have a record of it.
To do this I followed Doc ID 1082299.1, section "If you don't know current password".
Everything works fine in steps 1 through 7.
step 8, create boot. properties file
step 9 startWeblogic.sh

I created boot.properties file, but weblogic fails with - Authentication for user weblogic denied
removed boot.properties file, to prompt me for username/password, same thing.  weblogic fails with - Authentication for user weblogic denied

Where do I go wrong?

Thanks!