It is possible, if you have SSH access and if you have NO Ignition Key set on Universal Server.

First you have to find out which account name has has super user access:

For this you want to issue this command on SSH:

psql oviddb ovidr -c "SELECT name,roleid from omc_administrator;"

Then note down the user name which has the role "ROLE_SUPERUSER"

Then set a new password for this user by issuing this command where ADMIN in this example is your user name you noted down, and PASSWORD is your new password:

psql -U postgres -d oviddb -c "UPDATE omc_administrator SET passwordmd5='`slappasswd -s PASSWORD`' WHERE name='ADMIN';"

Once you have restored the password for a super user you can set/reset all passwords for all other users.