powershell - boost timeout retrieving xml url

i'm perplexing collect an xml tide url. many urls formula next works fine. but, i have integrate urls timeout. urls doubt do work internet explorer.

$webclient=new-object "system.net.webclient"
[xml]$data=$webclient.downloadstring($url)

so, i went poison proceed boost timeout period. i've read, i trust i can't controlling system.net.webclient. i cruise i need system.net.webrequest instead, nonetheless i can't work. formula i've operative below:

$myhttpwebrequest = [system.net.webrequest]::create($url)
$myhttpwebrequest.timeout = 600000
$myhttpwebresponse = $myhttpwebrequest.getresponse()
$sr = new-object system.io.streamreader($response.getresponsestream())
[xml]$xml = [xml]$sr.readtoend()

the urls i'm perplexing opening middle company, i can't post them. but, work ie tangible url should irrelevant.

ideas?

edit: rough contrast shows adding $myhttpwebrequest.authenticationlevel = "none" works. interjection scott saad.