The following error appears when you open File Sharing for any subscription.
Internal error: Unable to access File Sharing repository with the system user name "admin": Wrong username or password.
In Event Viewer > Windows Logs > Security you can see records like:
An account failed to log on. Account For Which Logon Failed: Security ID: NULL SID Account Name: admin Account Domain: Failure Information: Failure Reason: The specified account's password has expired.
Account For Which Logon Failed: Security ID: NULL SID Account Name: admin Account Domain: Failure Information: Failure Reason: Unknown user name or bad password.
'admin' account password has unsynced/expired.
Change admin password:
"%plesk_bin%\init_conf.exe" -u -passwd New_Plesk_Password
In case of "Unknown user name or bad password." you can just sync admin password by the following command:
net user admin <current_admin_password>
If changing password doesn't help then execute following command: