Article ID: 2860302 - View products that this article applies to.
A user experiences the following symptoms in a hybrid deployment of on-premises Microsoft Exchange Server and Microsoft Exchange Online in Office 365:
This issue may occur if the root certificates on the Exchange hybrid server are missing or corrupted. These certificates are used to validate your on-premises Exchange environment.
To resolve this issue, update the root certificates, and then rerun the Hybrid Configuration Wizard on the hybrid server. To do this, follow these steps.
Be aware that these steps must be completed by an Office 365 administrator. If you are a user who is experiencing this issue, contact your administrator to resolve this issue.
Step 1: Update the root certificatesTo update the root certificates, run Windows Update on the Exchange hybrid server.
For more information about how to update root certificates for a particular version of Windows or about how to use Group Policy to distribute updates, see the following Microsoft Knowledge Base article:
(http://support.microsoft.com/kb/931125/ )Windows Root Certificate Program members
Step 2: Rerun the Hybrid Configuration WizardRerun the Hybrid Configuration Wizard to update the deployment and resolve the issue. For more information about how to run the Hybrid Configuration Wizard, go to the following Microsoft websites:
Still need help? Go to the Office 365 Community