Powershell - Test-Connection failed due to lack of resources - powershell

Question

Test-connection intermittently fails with a lack of resources error:
test-connection : Testing connection to computer 'SOMESERVER' failed: Error due to lack of resources
At line:1 char:45
+ ... ($server in $ServersNonProd.Name) { test-connection $server -Count 1}
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ResourceUnavailable: (SOMESERVER:String) [Test-Connection], PingException
+ FullyQualifiedErrorId : TestConnectionException,Microsoft.PowerShell.Commands.TestConnectionCommand
As a result, it's not reliable and fairly useless when you need to test a list of computers in a loop. Is there a fix, alternative, or workaround to get this functionality reliably?
This is my current solution, but it's still not sufficiently reliable (sometimes they still fail 5 times in a row) and it takes forever because of all the delays and retries.
$Servers = Import-CSV -Path C:\Temp\Servers.csv
$result = foreach ($Name in $Servers.FQDN) {
$IP = $null
if ( Resolve-DNSName $Name -ErrorAction SilentlyContinue ) {
$IP = (Test-Connection -Count 1 -ComputerName $Name -ErrorAction SilentlyContinue).IPv4Address
if ( $IP -eq $null ) {
Start-Sleep -Milliseconds 100
$IP = (Test-Connection -Count 1 -ComputerName $Name -ErrorAction SilentlyContinue).IPv4Address
}
if ( $IP -eq $null ) {
Start-Sleep -Milliseconds 200
$IP = (Test-Connection -Count 1 -ComputerName $Name -ErrorAction SilentlyContinue).IPv4Address
}
if ( $IP -eq $null ) {
Start-Sleep -Milliseconds 300
$IP = (Test-Connection -Count 1 -ComputerName $Name -ErrorAction SilentlyContinue).IPv4Address
}
if ( $IP -eq $null ) {
Start-Sleep -Milliseconds 400
$IP = (Test-Connection -Count 1 -ComputerName $Name -ErrorAction SilentlyContinue).IPv4Address
}
}
new-object psobject -Property #{FQDN = $Name; "IP Address" = $IP}
}
A normal ping (ping.exe) works every time, so if there's a good way to parse that with powershell (host up or down, what IP is responding), that seems like the ideal solution, but I just need something that works, so I'm open to ideas.

Answer 1

In newer versions of PowerShell, the -Quiet parameter on Test-Connection does seem to always return either True or False. It didn't seem to work consistently on older versions, but either I'm doing something differently now or they've improved it:
$Ping = Test-Connection -ComputerName $ComputerName -Count 1 -Quiet
I haven't tested it recently when the network is simply unavailable, however.
Older answer:
Test-Connection doesn't respond well when DNS doesn't respond with an address or when the network is unavailable. That is, if the cmdlet decides it can't send the ping at all, it errors in unpleasant ways that are difficult to trap or ignore. Test-Connection is only useful, then, when you can guarantee that DNS will resolve the name to an address, and that the network will always be present.
I tend to use CIM Pings (Powershell v3+):
$Ping2 = Get-CimInstance -ClassName Win32_PingStatus -Filter "Address='$ComputerName' AND Timeout=1000";
Or WMI pings (Powershell v1 or v2):
$Ping = Get-WmiObject -Class Win32_PingStatus -Filter "Address='$ComputerName' AND Timeout=1000";
Either of which are basically the same, but return slightly different formats for things. Note that Get-WmiObject is not available at all beginning in Powershell v6 because Get-CimInstance was designed to supersede it.
The main disadvantage here is that you have to resolve the status code yourself:
$StatusCodes = #{
[uint32]0 = 'Success';
[uint32]11001 = 'Buffer Too Small';
[uint32]11002 = 'Destination Net Unreachable';
[uint32]11003 = 'Destination Host Unreachable';
[uint32]11004 = 'Destination Protocol Unreachable';
[uint32]11005 = 'Destination Port Unreachable';
[uint32]11006 = 'No Resources';
[uint32]11007 = 'Bad Option';
[uint32]11008 = 'Hardware Error';
[uint32]11009 = 'Packet Too Big';
[uint32]11010 = 'Request Timed Out';
[uint32]11011 = 'Bad Request';
[uint32]11012 = 'Bad Route';
[uint32]11013 = 'TimeToLive Expired Transit';
[uint32]11014 = 'TimeToLive Expired Reassembly';
[uint32]11015 = 'Parameter Problem';
[uint32]11016 = 'Source Quench';
[uint32]11017 = 'Option Too Big';
[uint32]11018 = 'Bad Destination';
[uint32]11032 = 'Negotiating IPSEC';
[uint32]11050 = 'General Failure'
};
$StatusCodes[$Ping.StatusCode];
$StatusCodes[$Ping2.StatusCode];
Alternately, I've used .Net Pings like #BenH described, too, which does a lot of that work for you. There was a reason I stopped using them in favor of WMI and CIM, but I can no longer remember what that reason was.

Answer 2

I am partial to using the .Net Ping class rather than Test-Connection
$Timeout = 100
$Ping = New-Object System.Net.NetworkInformation.Ping
$Response = $Ping.Send($Name,$Timeout)
$Response.Status
Note that the Send method can take additional parameters if you need to set TTL/Fragmentation. Also timeout is in milliseconds, with just $name the timeout I think is 5 seconds, which is usually too long.

Answer 3

Windows IP Helper defines IP_REQ_TIMED_OUT error to value 11010 wich is the same as Windows system error WSA_QOS_ADMISSION_FAILURE 11010 'Error due to lack of resources.'
so it is likely that what actually received in questioned case was time out error and simply misinterpreted as 'lack of resources'.

Answer 4

powershell v7 does not suffer from this issue when using test-connection

Answer 5

I'm going to cheat and use powershell 7. Microsoft is always unpingable.
test-connection -count 1 yahoo.com,microsoft.com | select destination,status
Destination Status
----------- ------
yahoo.com Success
microsoft.com TimedOut
Or multi-threaded:
echo yahoo.com microsoft.com | % -parallel { test-connection -count 1 $_ } |
select destination,status
Destination Status
----------- ------
yahoo.com Success
microsoft.com TimedOut
,'microsoft.com' * 10 | % -parallel { test-connection -count 1 $_ } |
select destination,status
Destination Status
----------- ------
microsoft.com TimedOut
microsoft.com TimedOut
microsoft.com TimedOut
microsoft.com TimedOut
microsoft.com TimedOut
microsoft.com TimedOut
microsoft.com TimedOut
microsoft.com TimedOut
microsoft.com TimedOut
microsoft.com TimedOut
# one time takes like 4 seconds
measure-command { ,'microsoft.com' * 10 | % -parallel { test-connection -count 1 $_ } |
select destination,status } | % seconds
9

Answer 6

I see this error when (in 5.x anyway) i include -computername in test-connection.
remove that and it works. The other thing about using ping vs test-connection, ICMP is blocked by default with the windows firewall where test-connection does the equivalent of the win32_pingstatus command. WMI is not blocked by default. However, if the WMI repository on the system is not healthy (or blocked by fw) it will of course fail.