Can you refer to the updated reply again... It is IFS Middleware server admin user credentials. Not the IFSADMIN user. These users are configured in the installation itself. So this user typically carries the username, ‘ifs’.
IFS user which is used to access the Admin console is a pure WebLogic user that is not created in the database like the rest of the application users. Password information(including this user) in the config files(usually the <Instance_Name>_configuration.xml) are encrypted and without knowing the current password you will not be able to reset it.
Moreover, if you do not know that, you will have to create a support issue to get the password reset.
The most ethical and the recommended(safest as well) way to do this is to raise an LCS case at IFS for that.
There is an additional script to change these middle tier passwords, but it won’t be useful in your case since to use those scripts, you need to know the existing password of the ‘ifs’ user.(<ifs_home>/instance/<instance_name>/bin/)
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