The documentation portal is undergoing maintenance. During this period, you can't create any new user credentials. If you do, you'll need to recreate the user credential after the maintenance period ends.
Informatica encrypts passwords sent from application clients to the Service Manager. Informatica uses AES encryption with multiple 128-bit keys to encrypt passwords and stores the encrypted passwords in the domain configuration database. Configure HTTPS to encrypt passwords sent to the Service Manager from application clients.