function GetDigestRealm($hostName, [bool]$tls)
{
	# Ping device to get HTTP headers.
	$url = if($tls -eq $true) { "https://" + $hostName + ":16993/wsman" } else { "http://" + $hostName + ":16992/wsman" } 
 
	$webReq = [System.Net.HttpWebRequest]::Create($url)
	$webReq.Method = "GET"
	$webReq.ContentLength = 0
	$response = $webReq.GetResponse()      
	
	trap [System.Net.WebException]
	{
		# Find authenticate header.
		for ($index = 0; $index -lt $_.Exception.Response.Headers.Count; $index++) 
		{
			$headers =  $_.Exception.Response.Headers 
			if($headers.GetKey($index).Equals("WWW-Authenticate"))
			{
				# Get the discovered digest realm string.
				$realm = 'Digest realm="'
				$value = $headers.Get($index)
				
				# Extract the digest realm.
				$start = $value.IndexOf($realm)
				$end = $value.IndexOf('"', $start + $realm.Length + 1)						
				return $value.Substring($start + $realm.Length, $end - $start - $realm.Length)
            }
        }
    }
}