Article ID: 2786061 - View products that this article applies to.
Note This scenario applies only to Microsoft Office 365 customers who have a hybrid deployment of Exchange Online and on-premises Exchange Server.
When you try to use the Microsoft Remote Connectivity Analyzer tool to troubleshoot Microsoft Exchange ActiveSync (EAS) in your organization, you receive the following error message:
Note When you run the test, an HTTP request is sent to the MobileSync Autodiscover provider on the Client Access server. This request is made to obtain an external URL for ActiveSync devices to use when ActiveSync devices connect to the Exchange server.
ActiveSync URL was in an Invalid format. It should be https://host/Microsoft-Server-ActiveSync. The URL was <Your URL>.
This issue occurs if the external URL isn't in the following format:
https://<hostname>/Microsoft-Server-ActiveSyncNote In this URL, the <hostname> placedholder represents the fully qualified domain name (FQDN) of the external Domain Name System (DNS) that ActiveSync devices use to connect to EAS.
To fix this issue, check the setting of the ExternalURL property for the Microsoft-Server-ActiveSync virtual directory on the on-premises Exchange server. To do this, follow these steps:
Still need help? Go to the Office 365 Community
Article ID: 2786061 - Last Review: July 9, 2014 - Revision: 8.0