Remote shutdown results in Access is Denied (5) message

I have browsed the other articles on here about people with similar problems, but I have tried everytyhing suggested and still I cannot get it to work.  I am trying this:

shutdown /r /m \\remotecpu
This produces:
Access is denied.(5)

I am logged into the domain machine as Administrator, the remotecpu I'm trying to shutdown has the domain Administrator added as an administrator, I have tried adding the domain admin to the local security policy -> allow remote shutdown and nothing seems to be working.  Right away I get access is denied.

Why is this?
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Nirmal SharmaSolution ArchitectCommented:
One second...Shutdown command runs the security context of SYSTEM Account and Administrator account. From where are you issuing this command ?
Pete LongTechnical ConsultantCommented:
Try downloading the pstools suite from  I use these for remote reboots, shutting down users applications, viewing their processes, etc...
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benbeckerAuthor Commented:
I've tried PS tools and I still get access denied.  one other thing I notice is that I do not have access to the administrative shares on my clients.
Do the clients have a firewall solution on?  Windows Firewall will block you out.
benbeckerAuthor Commented:
Yeah, I thought that. I tested it by turning it off, still same thing.  I think it is somehow related to another issue I'm having where I cannot access from the domain server the clients administrative shares.  Something just seems messed up.  I also think that if you have file and print sharing enables in the firewall, remote reboot works because this is what I had to do on the old domain server for rebooting my XP clients.  Is there anything different in SBS 2003?  Any policies enabled by default, etc.?
benbeckerAuthor Commented:
Turns out this is all related to my clients not being joined on my domain properly in addition to SMB signing.  I amended the SMB signing properties in the group policy of the domain and then rejoined my clients and all access is now ok from domain server to client.

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Windows Server 2003

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