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The piadmin password is usually set to blank.
You can reset the password using directions in 19OSI8 - How do you reset the piadmin password
IMPORTANT NOTE: Using the PI password authentication (explicit login with a name / password for a PI User) exposes an authentication security weakness. OSIsoft recommends you upgrade to PI Server 3.4.380 with PI SDK 1.3.6 clients and configure PI Mapping records for authentication instead, and disable the PI password authentication.