You tried to restart a windows 2003 via RDP, but unfortunately the server didnĀ“t reboot, but you lost the RDP session. How can you restart the server now?
One option would be to connect with a AD user who has access to restart this server to another Server/PC and perform the following CMD command (with the correct server IP):
shutdown /m \\10.10.10.10 /t 1 /r /f