Vista - RPC server unavailable

Below is the error I am getting. I am getting the name of installed apps on
remote machines. It works if I query my local machine. I have never needed
to provide authentication for accessing WMI objects but do i need it for this
particualr object? The variable $computername does hold an available
computername I have already tested that.

Get-WmiObject : The RPC server is unavailable. (Exception from HRESULT:
0x80070
6BA)
At C:\getcomputerlist.ps1:8 char:22
+ $applications = gwmi <<<< Win32_product -computername '$computername'

put $computername variable in double quotes, not in single. If you set
variable in single quotes PowerShell wil not expand variable. See examples:

[vPodans] $computername = "computer"
[vPodans] '$computername'
$computername
[vPodans] "$computername"
computer

you see, that variable is expanded only in double quotes.

Enjoy!
--
WBR, Vadims Podans
PowerShell blog - www.sysadmins.lv

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Great that fixed it. It seems that there are instances where sometimes I
have had to use single quote and sometimes double quotes to expand my
variable am i not remembering correctly?

Thanks for your help.

"Vadims Podans" wrote:

You're right. In WMI queries you will frequently use double and single
quotes compination. For example:

gwmi win32_share -filter "name = '$name' "

here variable is in single quotes. But here also are outer double quotes.
Outer quotes determine will be expanded inner variables or not. See these
examples:
[vPodans] $computer = "variable"
[vPodans] " '$computer' "
'variable'
[vPodans] ' "$computer" '
"$computer"

There is only one reason, why we should use single quotes inside double
quotes - parameter value may contain spaces. Therefore we should put value
into quotes to represent value with spaces as whole string. If you put value
in double quotes (when you already have outer double quotes) you'll get
quotes violation.
Enjoy!

--
WBR, Vadims Podans
PowerShell blog - www.sysadmins.lv

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