Why Windows Server remotely shutdown/reboot failed?

This is attempt to reboot a MS Windows Server 2008 R2. I tried to use "Shutdown.exe' and also "PSShutdown.exe", but both methods failed.
This is how I tried:

       a. I logged as member of domain admin on my laptop (Windows 7)
       b. open command prompt, type "psexec \\w2k8r2Server cmd"; connection successfully      *w2k8r2server is the target server
       c. in c:\windows\system32, type "shutdown -r -f"
   
          A system shutdown is in progress. (1115)

      However, system is not rebooting. Later I tried the PSShutdown, same result.

According to some forums, I even "pskill winlogon" and then "pskill trustedinstaller". still same result.

Besides Remote registry service, any services, such as, remote administration and firewall ports need to open?

Please help.
LVL 1
MichaelBalackSenior System EngineerAsked:
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Kamal KhaleefaInformation Security SpecialistCommented:
Maybe the server is in hang state
S long as you are member of domain admins or local admins on server you should able to use this method

there is  a way to connect to the server remotley even if its hang or shutteddown
For dell its called idrac
For hp its called ilo
For fujitsu irac
Etc you can configure it and access the server using web browser

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MichaelBalackSenior System EngineerAuthor Commented:
Thanks for Expert - King2002 in reminding that iLO/iDRAC is the way to go. I nearly forgot to "forcibly" reset the server, and now the server is back in production with 100% working condition.
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Windows Server 2008

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