Checking operating systems of a list of computers failing, individually works fine

Hello all,

I am verifying operating systems on the network and I can do a

(Get-WMIObject Win32_OperatingSystem -computername comp1).name

everything works fine. I can gather the OS of each machine if I do them one at a time. When I try to do the following foreach, it fails.

$computerlistfile = "C:\complist.txt"
$computerlist = Get-Content $computerlistfile -ErrorAction SilentlyContinue
foreach($computer in $computerlist){
Write-Output $computer | Out-File -append C:\OSlist.txt
(Get-WMIObject win32_operatingsystem -computername $computer).name | out-file -append C:\OSlist.txt}

When I try and execute via the foreach I get a return of a "The RPC server is unavailable" but then I can verify each computer individually. I have tried to break it down line by line to see if a path was incorrect or something, everything checked out until the actual gwmi. Any help is appreciated.

Thanks,

Paul