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Get-WmiObject win32_operatingsystem not working properly thru Windows XP Firewall

Posted on 2009-04-21
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I'm trying to reboot a host remotely using windows powershell.  I use

Get-WmiObject win32operatingsystem -computername MyHost

and the error I see:

Get-WmiObject : The RPC server is unavailable. (Exception fom HRESULT:0x800706BA)

I've been able to track down the cause: it's the Windows XP firewall on MyHost.  Disabling the firewall makes it work.

So I've been trying to set up the right exception and I'm running into a problem.  At minimum I needed to open port 135 TCP.  But making this work requires another port to be opened, but that port seems to be changing every time I reboot MyHost.  It's in the range of 1090-1160.  I established this fact by looking at the firewall logs.  When I open the second port it starts to work, but after a reboot, that port changes.  I see from netstat and tasklist commands that svchost.exe is listening on that port.

I really want to keep the firewall on.

I realize this is a tough problem.  Has anyone seen this and has a work-around?

Perhaps:

- a way to specify an exception for multiple ports in the Firewall
- a way to require svchost.exe to use the same port
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Question by:sevzas
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Expert Comment

by:Jared Luker
ID: 24197298
Is file and print sharing enabled?  I have problems doing anything remotely on my machines at work if that service is disabled.
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Author Comment

by:sevzas
ID: 24197338
File and Printing is enabled.  The problem is centered around getting the ports opened reliably in the firewall.
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sevzas earned 0 total points
ID: 24198335
The answer is that there is another place to enable special rules for the firewall.  Microsoft has documented this at

http://technet.microsoft.com/en-us/library/bb490616.aspx#EJAA

to launch the Group Policy tool, run "gpedit.msc".  Use the directions in the link above to change the "Allow remote administration exception" to "Allow".
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