Windows Server 2019 password reset

To reset password in Windows Server 2019 machine use:

Boot using Windows 2019 installation DVD
After your computer boots from the disc, select your language and keyboard and then Next.
Select Repair your computer at the lower left corner.
Select Troubleshoot and then choose Command Prompt.

Execute the following two commands, and press Enter after each.

move c:\windows\system32\utilman.exe c:\windows\system32\utilman.exe.bak
copy c:\windows\system32\cmd.exe c:\windows\system32\utilman.exe

Remove the disc and run command wpeutil reboot to restart your computer.
When login screen appears, click Ease of Access icon at the lower right corner (or Windows Key + U) to open a Command Prompt.
Execute the net user command as shown to reset the Windows Server 2019 Administrator password.
```
net user Administrator <new-password>
```
Close the Command Prompt window.
Log in to Windows 2019 server with your new password!
Access to Command Prompt again and execute the following:
```
copy c:\utilman.exe c:\windows\system32\utilman.exe
```

Refer:

Anonymous