When you receive the certificate warning message, click Show Certificate. This solution enables you to resolve the issue quickly for individual Mac clients without having to reissue the certificate. This enables you to resolve the issue for all Outlook for Mac clients without having to trust the certificate from each client individually. Reissue a certificate that includes the domain name as the Subject Alternative Name. To resolve this issue, use one of the following methods: This issue occurs in Outlook 2016 for Mac version 15.9 and later versions when Outlook performs an Autodiscover operation and tries to connect to a service endpoint whose expected name is not present on the server’s Secure Sockets Layer (SSL) certificate. However, the warning may reappear the next time that Autodiscover runs. When you receive this warning message, you can click Continue to accept the warning. If you continue, the information that you view and send will be encrypted, but will not be secure. In this scenario, you may receive a warning message that resembles the following:Ī secure connection cannot be established with the server because its intermediate or root certificate cannot be found. For example, Outlook performs an Autodiscover operation during Outlook start or periodically while Outlook runs. Applies to: Outlook for Mac for Office 365 Outlook 2016 for Mac – Non Office 365 Email Systems Only SymptomsĪssume that Microsoft Outlook 2016 for Mac performs an Autodiscover operation.
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