WSUS not able to synchronize

I get the following error message after trying to synchronize WSUS. My
firewall does block ports 80 or 443:

There was an error communicating with the upstream server. Please check your
update source and proxy server settings on the Synchronization Options page
--
Thank you

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ReadMe for Windows Server Update Services - This document describes known issues
affecting Windows Server Update Services (WSUS). It includes recommendations and
requirements for installing WSUS


"PRG" <> wrote in message
news:C502628E-B320-46E9-90D4-...
>I get the following error message after trying to synchronize WSUS. My
> firewall does block ports 80 or 443:
>
> There was an error communicating with the upstream server. Please check your
> update source and proxy server settings on the Synchronization Options page
> --
> Thank you