cannot connect to a soap api with php - php

Question

I'm trying to access this URI: http://143.166.84.118/services/assetservice.asmx?WSDL (Dell warranty info)
In Windows Powershell I can do this no problem:
$service = New-WebServiceProxy -Uri http://143.166.84.118/services/assetservice.asmx?WSDL
But in PHP:
$DELL_URL = "http://143.166.84.118/services/assetservice.asmx?WSDL"; //Access webproxy by IP
$soap = new SoapClient($DELL_URL);
Fatal error: Uncaught SoapFault exception: [WSDL] SOAP-ERROR: Parsing WSDL: Couldn't load from 'http://143.166.84.118/services/assetservice.asmx?WSDL' in C:\path\to\my\script.php:25 Stack trace: #0 C:\path\to\my\script.php(25): SoapClient->SoapClient('http://143.166....') #1 {main} thrown in C:\path\to\my\script.php on line 25
What am I doing wrong in php? I know the URL works cause it works with powershell.
As per Pete's suggestion I went to http://143.166.84.118/services/assetservice.asmx?WSDL and downloaded a local copy of the file then did this which worked:
$soap = new SoapClient($wsdlfilepath);
Do I always have to download a local copy of the file when using php?
edit: Didn't make any changes but now I'm getting "Uncaught SoapFault exception: [Client] looks like we got no XML document in..." error. Should I be worried about this? You can view the wsdl file by going to the link. Are there problems with it or extra white space? I didn't see any.