Help to Avoid WMI Delays

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    by n3rdbiker at 2012-09-13 12:13:46

    I am looking for a way to keep on trucking if I try to do a WMI query on a system and get a RPC Server Unavailable — I have no interest in resolving the issue, I would like to test the wmi connection and if it's not going to cooperate move on down the road to the next system. If it works, I have a list of WMI calls to make. I am already planning on skipping systems that I can't talk to at all – so it's primarily ones that are currently throwing the RPC Server Unavailable Exception.



    by DonJ at 2012-09-13 12:19:39

    The only real way to test it is with a WMI call... so the trick is to just trap the error.

    $it_worked = $true
    try {
    get-wmiobject -class win32_BIOS -computername $whatever -erroraction stop
    } catch {
    $it_worked = $false
    if ($it_worked) {
    # rest of code goes here

    Kinda like that. This won't get rid of the timeout involved in WMI figuring out it won't work, but there's not really a great way to avoid that timeout, either. You could precede this with a ping (Test-Connection), I suppose, but even if that works there's no guarantee WMI will.

    by RichardSiddaway at 2012-09-13 12:37:15

    Test-Connection uses the WMI class Win32_PingStatus so if you get a response from test-connection you should be OK

    One option is
    $comp = $env:COMPUTERNAME
    if (Test-Connection -ComputerName $comp -Count 1 -Quiet ) {
    < do lots of stuff >
    else {
    < it didn't work>

    Use the -Quiet means to get a Boolean (true/false) returned so works if very nicely

    by DonJ at 2012-09-13 13:09:43

    Actually, Win32_PingStatus just sends an ICMP ping – it doesn't actually test connectivity to the WMI RPC endpoint. A ping might work, but RPC wouldn't, and vice-versa, depending on the systems' configuration.

    But if you're sure that your target systems will always allow a ping if they're online, then it's a good first check. I have a lot of servers whose firewalls won't permit a ping, but they will permit an RPC, so Test-Connection will fail when Get-WmiObject won't.

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