Before you go about re-installing, you could give this method a go.
You will need to ssh into the applications server. I use a Mac, and use the native terminal application.
If you are using Windows, then I think it's Putty or something like that.
Anyway, below is assuming your using Administrator as the IP Office Administrator user.
ssh Administrator@x.x.x.x
enter the Administrator password when prompted. <-Same password you use in Manager
Type: admin and press Enter
Type: Administrator
Enter the Administrator password when prompted again. <-Same Password as you use in Manager.
Type: root
Enter the root password <- I hope you have this, it is different than the Administrator Password
Once you have Root Shell access use the following commands to reset the One-X Portal Admin account.
cd /opt/Avaya/oneXportal/*/scripts
# Use following command to reset local Admin password of One-X Portal.
./resetadmin.sh resetpassword admin
This will set the Local Administrator password of One-X Portal to default (i.e. Administrator).
Once you login to one-X Portal Admin, the password needs to be changed. This will be your new Local Administrator password.
The Local Administrator password of one-X is used to access the One-X Portal Admin ONLY if referred authentication is disabled.
Good luck!
Travis