If you are using Contabo, go to the control panel and add the server you want to sign up for from ‘New Order’.
Set the Administrator password to between 16 and 18 digits.
Note that when I set a long password of 28 characters, I could not log in even with the correct password.

Connect to a Windows Server 2025 set up using a remote desktop connection.
Create an administrator account other than Administrator as soon as possible after logging into Windows Server 2025.
This is the default setting after setup, and is enabled in the Account Lockout Policy, including the Administrator account, to prevent the account being locked and unable to do anything in an external attack, so add the Administrator account first.

Reinstall Windows Server 2025 Datacenter Edition
If you cannot log in with the Administrator account immediately after installation or if you are locked up, turn on Cloud-Init and click Reinstall to reinstall Windows Server 2025 Datacenter Edition. Reinstall by clicking Reinstall with Cloud-Init on.
If Cloud-Init is switched off, Windows Server 2025 (64-bit) will not appear as an option.

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