Error handling - PowerShell script

Question

I have the following powershell script that cycles through a list of hostnames and changes the DNS settings for the active interfaces:

$servers = Get-Content C:\users\kevin.todd\desktop\serverlist.txt 



foreach($server in $servers)

{

    Write-Host "Connect to $server..."

    $nics = Get-WmiObject Win32_NetworkAdapterConfiguration -ComputerName $server -ErrorAction Inquire | Where{$_.IPEnabled -eq "TRUE"}

    $newDNS = "10.100.10.81","10.100.10.82"

    foreach($nic in $nics)

    {

        Write-Host "`tExisting DNS Servers " $nic.DNSServerSearchOrder

        $x = $nic.SetDNSServerSearchOrder($newDNS)

        if($x.ReturnValue -eq 0)

        {

            Write-Host "`tSuccessfully Changed DNS Servers on " $server

        }

        else

        {

            Write-Host "`tFailed to Change DNS Servers on " $server

        }

    }

}

The problem is on some hosts I get the following error:

Get-WmiObject : The RPC server is unavailable. (Exception from HRESULT: 0x800706BA) At C:\Documents and Settings\user1\desktop\changednsserver.ps1:20 char:26 + $nics = Get-WmiObject <<<< Win32_NetworkAdapterConfiguration -ComputerName $server -ErrorAction Inquire | Where{ $_.IPEnabled -eq "TRUE"} + CategoryInfo : InvalidOperation: (:) [Get-WmiObject], COMException + FullyQualifiedErrorId : GetWMICOMException,Microsoft.PowerShell.Commands.GetWmiObjectCommand
Existing DNS Servers You cannot call a method on a null-valued expression. At C:\Documents and Settings\user1\desktop\changednsserver.ps1:30 char:42 + $x = $nic.SetDNSServerSearchOrder <<<< ($newDNS) + CategoryInfo : InvalidOperation: (SetDNSServerSearchOrder:String) [], RuntimeException + FullyQualifiedErrorId : InvokeMethodOnNull

And I'm asked the following question by Powershell:

The RPC server is unavailable. (Exception from HRESULT: 0x800706BA) [Y] Yes [A] Yes to All [H] Halt Command [S] Suspend [?] Help (default is "Y"):

I would like the script to just answer A - Yes to all and continue running the script. The problem is it just halts the script until I manually enter "A". How can I have it automatically answer and continue?

EBGreen · Accepted Answer · 2011-08-11 20:13:48Z

3

Well the short answer is to not tell it to stop in the first place:

$nics = Get-WmiObject Win32_NetworkAdapterConfiguration -ComputerName $server -ErrorAction Inquire | Where{$_.IPEnabled -eq "TRUE"}

Try:

$nics = Get-WmiObject Win32_NetworkAdapterConfiguration -ComputerName $server -ErrorAction SilentlyContinue | Where{$_.IPEnabled -eq "TRUE"}

answered Aug 11, 2011 at 20:13

EBGreen

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2 Comments

manojlds Over a year ago

OP would have to see the error still to know what's happening. So it should be Continue

EBGreen Over a year ago

Sorry, my read of the question was that the OP didn't care whether the error was visible or not. If I'm mistaken on that then sure, -ErrorAction Continue would be correct.

Netspark · Accepted Answer · 2018-02-20 14:16:22Z

If you need to see where Errors occur, you have also a possibility to define an error variable using the switch -ErrorVariable $<variable>

If errors occur in a foreach loop, the Error variable will be an array of error messages you can later analyze by querying the defined error variable with an array index echo $<EVariable>[<index>]

it would be something like echo $MyErrorArray[0] to get the first occurred error in that array.

An elegant way would be to have all that added to a textbox/combobox for log purposes but the coice of error handling ananalyzing is yours.

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