Exchange 2013 - AutoReply not replying to external mail

Good day

A strange problem has come up on my exchange 2013 cu2. The out of office assistance is not replying to external mails, internally it is working. I have check with multiple accounts with the same result, both setup with outlook and owa 

i have run the (Synchronization, Notification, Availability, and Automatic Replies) https://www.testexchangeconnectivity.com/ test, their is no error, also the oof  url is configured in the outlook.

the Get-MailboxAutoReplyConfiguration powershell showes

RunspaceId       : 9a906239-ceb0-4b85-921e-643354de8422
AutoReplyState   : Enabled
EndTime          : 09/19/2013 09:00:00 AM
ExternalAudience : All

IsValid          : True
ObjectState      : Unchanged

Thanks in advance