Force WSUS Client to Poll WSUS Server

Can anyone tell me a way after an update is approved to force the Wsus client to check in and pull down the updates on demand instead of waiting for the specified time interval? Thanks for the reply.

You will need to run wuauclt.exe /detectnow by opening a command prompt on the client, that will fix the issue for you.

Thanks but the command that you have given does not seem to work, is there any other solution?

You can try to do that by using the below script:

Code:

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Set updateSession = CreateObject("Microsoft.Update.Session")

Set updateSearcher = updateSession.CreateUpdateSearcher()
Set updateDownloader = updateSession.CreateUpdateDownloader()
Set updateInstaller = updateSession.CreateUpdateInstaller()

Do

  WScript.Echo
  WScript.Echo "Searching for approved updates ..."
  WScript.Echo

  Set updateSearch = updateSearcher.Search("IsInstalled=0")

  If updateSearch.ResultCode <> 2 Then

    WScript.Echo "Search failed with result code", updateSearch.ResultCode
    WScript.Quit 1

  End If

  If updateSearch.Updates.Count = 0 Then

    WScript.Echo "There are no updates to install."
    WScript.Quit 2

  End If

  Set updateList = updateSearch.Updates

  For I = 0 to updateSearch.Updates.Count - 1

    Set update = updateList.Item(I)

    WScript.Echo "Update found:", update.Title

  Next

  WScript.Echo

  updateDownloader.Updates = updateList
  updateDownloader.Priority = 3

  Set downloadResult = updateDownloader.Download()

  If downloadResult.ResultCode <> 2 Then

    WScript.Echo "Download failed with result code", downloadResult.ResultCode
    WScript.Echo

    WScript.Quit 1

  End If

  WScript.Echo "Download complete.  Installing updates ..."
  WScript.Echo

  updateInstaller.Updates = updateList

  Set installationResult = updateInstaller.Install()

  If installationResult.ResultCode <> 2 Then

    WScript.Echo "Installation failed with result code", installationResult.ResultCode

    For I = 0 to updateList.Count - 1

      Set updateInstallationResult = installationResult.GetUpdateResult(I)
      WScript.Echo "Result for " & updateList.Item(I).Title & " is " & installationResult.GetUpdateResult(I).ResultCode

    Next

    WScript.Quit 1

  End If

  If installationResult.RebootRequired Then

    WScript.Echo "The system must be rebooted to complete installation."

    WScript.Quit 3

  End If

  WScript.Echo "Installation complete."

Loop

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Did you try using the following:
bitsadmin /monitor /allusers

And checked if that is working for you or not?