HI Friends,

I was trying to build a script to ping a set of computer but it fails whenever we have a computername in the list which doesnot not exist. Script is working fine otherwise :

$ping = new-object System.Net.NetworkInformation.Ping
$p=$ping.send("computername")

Now if computername exist then above command runs fine and give result as success but is "computername" doesnot exist then it thros the errors like :

Exception calling "Send" with "1" argument(s): "An exception occurred during a Ping request."
At line:1 char:14
+ $p=$ping.send <<<< ("dc1.test.com")
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException




Now to add error handling I was trying :

$p=$ping.send("computername")  -ea silentlycontinue -ev +err but it fails with :




You must provide a value expression on the right-hand side of the '-' operator.
At line:1 char:31

Unexpected token 'ea' in expression or statement.
At line:1 char:32

Unexpected token 'silentlycontinue' in expression or statement.
At line:1 char:35

You can use Test-Connection with the -Quiet switch:

if (Test-Connection -ComputerName "computer_name" -Quiet)
{
"computer responded"
}
else
{
"computer did not respond"
}

Hi,

But again if due to some reason if computer_name doesnot exis, it will throw the error.

Regards
Yogesh

You can add proper ErrorAction to prevent errors:

if (Test-Connection -Quiet -Count 1 -ComputerName NonExistingHost -ErrorAction SilentlyContinue) {            
    'Host is there'            
} else {            
    'Host is missing'            
}

HTH Bartek

This may still throw an exception, but it will be caught in the catch block where it will write the type of the exception to the console:

$ErrorActionPreference = "Stop"

$ping = New-Object System.Net.NetworkInformation.Ping

try
{
    $pingReply = $ping.Send("computername")
}
catch [System.Net.NetworkInformation.PingException]
{
    $_.Exception.InnerException.GetType().ToString()
}

switch ($pingReply.Status)
{
    Success { }
    DestinationNetworkUnreachable { }
    DestinationHostUnreachable { }
    DestinationProtocolUnreachable { }
    DestinationPortUnreachable { }
    DestinationProhibited { }
    NoResources { }
    BadOption { }
    HardwareError { }
    PacketTooBig { }
    TimedOut { }
    BadRoute { }
    TtlExpired { }
    TtlReassemblyTimeExceeded { }
    ParameterProblem { }
    SourceQuench { }
    BadDestination { }
    DestinationUnreachable { }
    TimeExceeded { }
    BadHeader { }
    UnrecognizedNextHeader { }
    IcmpError { }
    DestinationScopeMismatch { }
    Unknown { }
    default { }
}


Details of the enumeration values can be found here: http://msdn.microsoft.com/en-us/lib...tatus.aspx

when you specify the -Quiet switch test-connection returns a boolean result even if the target doesn't exist, no need to specify ErrorAction.


PS > Test-Connection -ComputerName IDontExist -Quiet -Count 1
False

Hi Shay, Thanks this is most convient way to do.

Hi GWHowarth88 ,

I tried your script but $pingreply.status didnt threw any value ??

Regards
Yogesh Malhotra

Works fine for me:

$ping = New-Object System.Net.NetworkInformation.Ping
$pingReply = $ping.Send("computername")
$pingReply.Status