You could start by posting in the WSUS newsgroup.

Forwarded to WSUS newsgroup
(microsoft.public.windows.server.update_services) via crosspost as a
convenience to OP.

On the web:
http://www.microsoft.com/communities... date_services

In your newsreader:
news://msnews.microsoft.com/microsof...pdate_services
--
~PA Bear

Peter Lawton wrote:
> What I am doing is this:-
>
> Open "Windows Update" in control panel
>
> Select "Check online for updates from Microsoft Update" in the right pane
> (as this machine is set up for WSUS clicking "Check for updates" in the
> left
> pane will check WSUS, not online)
>
> In the right hand pane I then get a red cross and a message "Windows could
> not search for new updates" and the informative "Error(s) found code
> 80244016"
>
> How do I fix this ?
>
> "TaurArian" <taurarianREMOVECAPS@gmail.com> wrote in message
> news:eQF4Yq1tIHA.4716@TK2MSFTNGP06.phx.gbl...
>> 0x80244016 - SUS_E_PT_HTTP_STATUS_BAD_REQUEST
>> Http status 400 - invalid syntax
>>
>> For Vista , the website has been replaced by Windows Update in Control
>> Panel. If you want
>> to check for updates manually, follow these steps:
>> 1. Open Windows Update by clicking the Start button, clicking All
>> Programs, and then
>> clicking Windows Update.
>>
>> 2. In the left pane, click Check for updates.
>>
>> "Peter Lawton" <dummy@dummy.domain> wrote in message
>> news:ecz4X0ytIHA.3420@TK2MSFTNGP04.phx.gbl...
>>> Running Windows Vista Business and can't run Windows update from the
>>> Microsoft site, I get the error 80244016
>>>
>>> I've re-built the PC from scratch after formatting the HDD and I still
>>> get
>>> the same error.
>>>
>>> This PC is able to update from WSUS OK.
>>>
>>> Other XP PCs with the same proxy and in the same OU can run Windows
>>> Update
>>> from the Web OK.
>>>
>>> Searches of the Web advise running "proxycfg -d " but as this is Vista
>>> is
>>> doesn't have "proxycfg"
>>>
>>> I don't suppose that error means anything sensible to anyone or that
>>> there's a fix for it ?