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Attempting to test potential Autodiscover URL https://autodiscover.domain.com/AutoDiscover/AutoDiscover.xml
Testing of this potential Autodiscover URL failed.
Test Steps
Attempting to resolve the host name autodiscover.domain.com in DNS.
The host name resolved successfully.
Additional Details
Testing TCP port 443 on host autodiscover.domain.com to ensure it's listening and open.
The port was opened successfully.
Testing the SSL certificate to make sure it's valid.
The SSL certificate failed one or more certificate validation checks.
Test Steps
ExRCA is attempting to obtain the SSL certificate from remote server autodiscover.domain.com on port 443.
ExRCA successfully obtained the remote SSL certificate.
Additional Details
Validating the certificate name.
Certificate name validation failed.
Tell me more about this issue and how to resolve it
Additional Details
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I presume you are referring to the autodiscover URL you have set in your Service Connection Point (SCP) for internal purposes? (Set using Set-ClientAccessServer -AutodiscoverServiceIntern
If so, the SCP is valid only for domain-joined machines. If you are connecting externally or from a non-domain machine, the value stored in Active Directory is not available to those computers. In these cases, Outlook automatically infers the URL, trying https://<smtp-domain>/Autodiscover
In this case, the process will fail because your SSL certificate does not mention autodiscover.domain.com as a valid DNS name.
How to resolve the problem?
-Matt