sync library in endnote X8 always fail

How to sync library in endnote X8?

Since I bought this endnote X8 about one year ago, I always fail to sync the library even in high speed internet access

The message always pop out when I try this. The message was: " Endnote could not connect to online sync service, this may due to temporary internet or server error, please try again."

How to overcome this

Please contact Technical Support directly

1-800-336-4474 option 4 then 1 or