Exchange Hybrid: cannot migrate Mailbox saying local ex server: refused to connect

Namless Shelter 216 Reputation points
2020-11-04T22:45:15.85+00:00

Hi There,

I have been moving mailboxes to online exchange successfully in the past.

In the morning, I was asked to move an old legacy mailbox to Exchange online, I just found out when I click on Move Mailbox: To exchange online, sign in to Office 365. It gave me a blank page saying: Ex01 (local ex server) refused to connect.

Do you know why?

Thanks
ML

Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
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  1. KyleXu-MSFT 26,211 Reputation points
    2020-11-05T06:31:02.977+00:00

    @Namless Shelter

    to exchange online, sign in to Office 365. It gave me a blank page saying: Ex01 (local ex server) refused to connect.

    Where do you try to create this migration request? As far as I know, there doesn't exist a step to "sign into Office 365"

    I would suggest you try to rerun HCW to check whether there exists issue in your organization. Then, login Exchange online admin center , then check whether the migration endpoint exist.

    Here is an article about how to migrate mailbox in hybrid, it may be useful to you: Move mailboxes between on-premises and Exchange Online organizations in hybrid deployments

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  2. Ashok M 6,506 Reputation points
    2020-11-05T06:50:40.993+00:00

    Hi,

    Please provide us with the Exchange server version and the type of migration. Also, check whether any changes made on the network firewall to block incoming/outgoing communication between the Exchange server and Office365.

  3. Matt Ivester 1 Reputation point
    2020-11-10T18:43:41.983+00:00

    I'm facing the exact same scenario and would love to find a fix.

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  4. Martin Gospodinov 6 Reputation points
    2021-02-01T12:00:55.273+00:00

    The same problem here. Tried Edge, Chrome, Firefox, Opera - private/non private. Tried different network, and different device. Enabled pop ups and redirecting, allowed cookies for [.]office.net,[.]live.com,[*.]microsoftonline.com. The problem still persists.

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  5. Kafui Nyadron 1 Reputation point
    2021-10-07T19:03:31.6+00:00

    A new build version of Exchange admin center has been released and the mailbox migration location has changed.

    Click on '' New Exchange Admin Center'' at the left menu list of exchange admin center then select migration
    138608-new-exchange-admin-center.png138589-migration-location.png

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