System admin error

After upgrade to latest version 13.0.49 on “updates” i checked today and i get this error
fopen(http://upgrades.schmoozecom.net/updates.php): failed to open stream: HTTP request failed!
Everything else is working fine.
DNS is working also.But
PING upgrades.schmoozecom.net (199.102.239.49) 56(84) bytes of data.–> NO answer
Any suggestions
Thanks

Minutes after posting ,issue is gone.
Thank you