For more information, see Certificate procedures in Exchange Server. Check whether you're using a valid TLS certificate, and whether it's installed correctly.If your environment already uses TLS 1.2 or later versions, do the following:
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Exchange Server TLS guidance, part 2: Enabling TLS 1.2 and Identifying Clients Not Using ItĪlthough Exchange Server version 2010 and later versions can be updated to enable TLS 1.2, earlier versions of Exchange Server have only the option to upgrade to a later version to be able to use Outlook for iOS or Outlook for Android.
Exchange Server TLS guidance, part 1: Getting Ready for TLS 1.2. Use the following guidance to enable TLS 1.2 for the Exchange Server and Windows Server in your environment. If your operating system currently uses TLS 1.2, the issue might be caused by an expired TLS certificate. They support only versions of Exchange Server and operating system environments that use TLS 1.2 or later versions. Outlook for iOS and Outlook for Android now block users from signing in to an environment that uses TLS 1.1 or 1.0. The version of Windows Server that's hosting the on-premises Exchange Server is version 2008 or an earlier version, and is using TLS 1.1 or 1.0. The version of Exchange Server that you're running uses TLS 1.1 or 1.0. This issue occurs if either of the following conditions is true: The connection to your mail server timed out.Īlso, mailbox synchronization might stop unexpectedly if your Exchange account is already added to Outlook. When you try to sign in to your Exchange on-premises account in Outlook for iOS or Outlook for Android, you receive the following error message:
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