Outlook Showing an Odd Error

Office 365 Security Owner todayNovember 11, 2019 4

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Sometimes users get a message of error when they start Outlook. The message says that “autodiscover.outlook-s.com” is invalid. Maybe ISPs DNS servers cause a blockade. Eevn a security check does not reveal any information that is worthwhile.

To know more about this error, go to the following link:

https://support.microsoft.com/en-us/help/2772058/the-name-on-the-security-certificate-is-invalid-or-does-not-match-the
  • Check with Google or CloudFlare DNS servers to see if the issue remains!
  • Use Autodiscover to automatically configure Outlook
  • Try no to use your ISP’s DNS but use Cloudfare, Google, Level 3 or any other DNS server.
  • bypass HTTPS
  • Run Microsoft Support and Recovery Assistant for Office 365on the link below:
https://diagnostics.outlook.com/#/

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