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NamlessShelter-6097 avatar image
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NamlessShelter-6097 asked MangLai-8971 commented

Deleted SCP, and powered off old Exchange 2010 serve, now it is getting this error when migrating

Hi there,

Please help.

We were running hybrid Environment with our Emails (Exchange 2010, Exchange 2016 and Office365)/....I am planning to decommission the old server 2010 Exchange server. It has been a few weeks after I deleted the SCP pointing to the old server 2010, and powered off the old exchange 2010 server.... it left with only running hybrid of exchange 2016 and Office 365.

Now, when I was trying to migrate an old mailbox from server 2016 database to office 365 online exchange account, I click migrate to the online exchange, I got this error: The connection to the server 'GUID.resource.mailboxmigration.his.msappproxy.net' could not be completed.

Would you think it is related to the old exchange server got powered off? Or somehow When I click on Migration Endpoint under Migration Tab, the there is no Endpoint any more...I remember there should be one entry here...

Thanks,
ML

office-exchange-hybrid-itprooffice-exchange-server-itpro
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Hi @NamlessShelter-6097

Any update about your question? Did you rerun HCW then verify the result again?

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AndyDavid avatar image
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AndyDavid answered NamlessShelter-6097 commented

Did you re-run the Hybrid Wizard and point it to the 2016 server?
Are the firewall rules updated to reflect the new server?

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No, I did not re-run hybrid Wizard. Do I have to? Firewall and DNS all pointing to the Exchange 2016 server.

I only deleted SCP Autodiscovery point and powered off the Ex2010 server. And sidetracked by something else, now I couldn't even migrate mailboxes from onprem to cloud....

Anything I can do to fix?

Thanks
Nameless

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AndyDavid avatar image
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AndyDavid answered NamlessShelter-6097 edited

If the Exchange endpoint has changed from the 2010 to the 2016 server, then yes you need to rerun the Wizard and ensure that 2016 server can communicate with the Microsoft endpoint on port 443 and 25.

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Hi Andy,

Is there a guide that I can do it? We were running the hybrid environment (Exchange 2010 & 2016 and Online Exchange) Maybe I will do it during the holiday, do not want to cause any outages.....

I checked Mailbox Replication Proxy Service enabled on both EWA virtual directories (server 2010 and 2016. Also, I can see Migration Endpoint is still there on the cloud. Maybe I can try migrate onprem mailboxes to cloud by using Migration on Exchange Online still?

Thanks a lot,

Nameless

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joyceshen-MSFT avatar image
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joyceshen-MSFT answered MangLai-8971 commented

Hi @NamlessShelter-6097

Yes, we need to rerun HCW, after rerunning HCW on Exchange 2016 server, it will switch hybrid end point from Exchange 2010 to Exchange 2016. So, you can uninstall Exchange 2010 sever after moving mailboxes from Exchange 2010 to Exchange 2016. (You can try to shutdown Exchange 2010 and observe a period of time before uninstall it.)

Make sure you have finished the below steps before uninstalling the server: Modify or Remove Exchange 2010 (applied to EX2016 as well)

  1. All Client Access server FQDNs are pointing to Exchange 2016.

  2. All mail flow connectors are pointing to Exchange 2016.

  3. All user and arbitration mailboxes have been moved to Exchange 2016.

  4. If you were using public folders, make sure the public folders databases have been migrated to Exchange 2016.

  5. Any Exchange 2010 CAS arrays you have configured must be removed.

  6. Make a list of applications that may be using Exchange 2010 and then make sure to configure these applications to start using Exchange 2016 if necessary.

You could check the step-by-step guide in this link as well: Hybrid Exchange 2010 To Hybrid Exchange 2016 - Part Two
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.


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Hi @NamlessShelter-6097

Is there any progress about this question so far? Waiting for your feedback here!

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Hi Joyceshen,

thanks for following up. I have been too busy with VMware upgrade.

We are planning to move full cloud Office 365 end of this year. Do you think it is oK to leave this for now since Exchange servers on Prem will be deleted?

So, Ex 2010 server has been powered off already for 1 month and have not configured the HCW to remove Ex01 yet. Anything might potentially go wrong during this time?

Thanks
ML

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