A few days ago there was an announcement about the new version of Azure AD Connect, version 1.1.484.0 to be exact.
On April 13 of last year, Microsoft announced the deprecation of Windows Azure Active Directory Sync (DirSync) and zure Active Directory Sync (Azure AD Sync) tools. And if you think about this... it's today!
So you should now get rid off and stop using the old tools, in order to avoid service interruption. Azure AD will stop accepting connections from DirSync and Azure AD Sync after December 31, 2017.