Available Update failed

[bluetear]

I'm using PLESK 8.2.1 and when I click on Update Icon and I got the Error message at

Available Update tab as

"Error: Unable to retrieve a list of available updates: Unable to run `pleskautoupdate` utility: System.Exception: The underlying connection was closed: Unable to connect to the remote server. http://pleskwin.download.swsoft.com/Plesk/Autoupdate/420FF3A6-FF3D-4B04-A9F2-896B2692EFB7.xml.crc
at PleskUpdater.Updater.check()
at PleskAutoUpdate.App.Main(String[] args)"


Please help to solve the problem.

Best regards,
Bluetear