Vista - PSJob+WinRM=Connection attempt failed.

Please help me to deside, where is error:

PS C:\> $job=Start-PSJob -command 'ls -rec c:\'

PS C:\> $job.JobStateInfo.state
Failed

PS C:\> $job.ChildJobs[0].JobStateInfo.Reason
Connection attempt failed.

PS C:\> Get-ExecutionPolicy
Unrestricted

PS C:\> (Get-Service -name 'winrm').status
Running

PS C:\> winrm id
IdentifyResponse
ProtocolVersion = http://schemas.dmtf.org/wbem/wsman/1/wsman.xsd
ProductVendor = Microsoft Corporation
ProductVersion = OS: 5.1.2600 SP: 2.0 Stack: 1.1

PS C:\> netsh firewall show portopening

Port Protocol Mode Name
-------------------------------------------------------------------
80 TCP Enable HTTP
443 TCP Enable HTTPS

PS C:\> (winrm e wmi/root/cimv2/win32_operatingsystem)|
?{$_ -match '(caption|version)'}
Caption = Microsoft Windows XP Home Edition
CSDVersion = Service Pack 2
PlusVersionNumber = null
ServicePackMajorVersion = 2
ServicePackMinorVersion = 0
Version = 5.1.2600

PS C:\> $PSVersionTable

Name Value
---- -----
CLRVersion 2.0.50727.1433
BuildVersion 6.1.6480.1
PSVersion 2.0
PSCompatibleVersions {1.0, 2.0}