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MarkBeckingham's avatar
MarkBeckingham
Copper Contributor
Aug 26, 2025

Moving Exchange Hybrid From Exchange 2016 To Exchange SE

 

Hi, I'm in the process of planning the migration of Exchange Hybrid connectivity from a single Exchange 2016 server to a single Exchange SE server.

 

Below are the steps I've carried out so far -

  1. Imported SSL certificate used by Exchange 2016 server to Exchange SE server & assigned services.
  2. Updated virtual directories URL's on Exchange SE server to match those used by Exchange 2016 server.
  3. Added Exchange SE server IP address to firewall rules allowing access to EOL where the Exchange 2016 server IP is present.

Questions I have -

  1. When I run the Hybrid configuration wizard on Exchange SE server if any of the firewall rules are incorrect will the wizard flag these?
  2. At what stage do I change internal\external DNS for Hybrid & Autodiscover to point to the IP address of Exchange SE server? If after HCW has been run successfully on Exchange SE, how quickly does DNS need to be updated, immediately, within 24hrs etc?
  3. Existing send connectors within Exchange 2016\EOL will they be auto updated with Exchange SE server added or new connectors created? If new send connectors created do you disable the old connectors used by Exchange 2016 then delete?

Thanks in advanced for any replies.

3 Replies

  • Dan_Snape's avatar
    Dan_Snape
    Iron Contributor

    the HCW won't specifically say there are firewall errors. There will just be a connection/network error. 

    DNS will need to be in place before you run the HCW, as it will try and connect using those namespaces when you run it.

    • MarkBeckingham's avatar
      MarkBeckingham
      Copper Contributor

      Thanks for the reply Dan, changing external\internal DNS before cutting Hybrid over to the new Exchange SE server won't this affect the existing connection with Exchange 2016 where mail flows between EOL?

      • Dan_Snape's avatar
        Dan_Snape
        Iron Contributor

        The whole idea for the change is to move mail flow to the new server, so yes it will affect where EXO sends mail. As long as you have your new Exchange server configured correctly, the change shouldn't casue an impact though.

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