Exchange 2010 to Exchange Online migration Error

Hello,
I am in the middle of an Exchange 2010 to Office 365 cutover migration and i keep getting errors when trying to create a migration endpoint on Office 365 hence the migration can't progress.
I have sucessfully completed step one which is to verify the on premises domain and the Office 365 domain but it seems i am stucked on connecting with Outlook Anywhere using each available method on Microsoft Remote Connectivity Analyzer.
The first error message that i am getting when connecting through Microsoft Remote Connectivity Analyzer is that the
"The certificate chain could not be built. You may be missing required intermediate certificate". On a side note, this works on internal LAN and Outlook clients are able to connect using autodiscover.
The second error message i get, is when trying to connect using "Test-MigrationServerAvailability -ExchangeOutlookAnywhere -Autodiscover -EmailAddress <email address for on-premises administrator> -Credentials $credentials"
on a Exchange Online Powershell session i am getting:
"The migration service failed to detect the migration endpoint using the Autodiscover service."
I just can't understand why the Autodiscover tests won't pass. I am aware that Microsoft Remote Connectivity Analyzer would show error because it misses the root certificate but what should i do in order to have it running properly?
Please note that i am using an internal CA-Server which is the Exchange Server it self so i have self signed certificates.
I wonder, am i missing the big picture here?
For the migration endpoint/batch to work, is it mandatory to have a valid certificate or to be able to use autodiscover?
Thanks.

You need valid publicly trusted certificate to create the migration endpoint. You can get one for free from sites like startssl or comodo.

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Hi ,
Can anyone help me on below points.
I have installed exchange 2013 , and able to view all mail box form existing server 2010.
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I'm working on setting up a pilot for Office 365. We have Exchange 2010 SP3, in a DAG configuration (two front end, and 2 mail box servers). I have setup the hybrid configuration. All firewall ports are open.
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"[email protected]
Status: Failed
[email protected] Skipped item details
Data migrated: Migration rate: Error: MigrationTransientException: The call to ‎'https://webmail.contoso.com/EWS/mrsproxy.svc City-ExchCAS1.contoso.local ‎(14.3.178.0 caps:05FFFF)‎‎' failed. Error
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Fixed
1. Connect to the Office 365 Portal http://portal.microsoftonline.com
2. Click “Admin” in the upper left hand corner and go to “Exchange”
3. Click “migration”
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7. Click “next”
8. Click “next”
9. Put any name for “*New migration batch name:”
10. Put <your email domain> for “*Target delivery domain:”
11. Put GUID of target database in for “*Target database:”
Commands for Exchange Management PowerShell to find GUID
i. Get-MailboxDatabase
ii. Get-MailboxDatabase <insert database name from last command> |fl
12. Click “next”
13. Make sure both radio buttons for Automatically are check, and click “new”

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Please mark as helpful if you find my comment helpful or as an answer if it does answer your question. That will encourage me - and others - to take time out to help you.

Exchange 2010 to 2013 users migration

Hi,
I am migrating users from Exchange 2010 to 2013 and facing a lot of migration issues. few of them are as follow.
1. It hung up at "syncing" and end up with a failure.
2. After a long migration i got the following errors
Error: MigrationPermanentExeception: Failed to reset the target mailbox after the move. Error Details:MaipExceptionADUnavailable: Unable to prepopulate the cache for user :: on domain controller xyz.domain.com (hr=0x80004005,ec=2414) Diagnosti Context: Lid:
65256 Lid:1494 ---- Remote Context Beg ---- Lid: 52664 StoreEc: 0x96E Lid: 35973 StoreEc: 0x96E Target Mailbox unlock operation was not replicated. If a lossy failover occurs after the target mailbox was unlocked, the target mailbox could remain inaccessible.
Error details: Target mailbox connection was lost.
3. users migration is taking a lot of time although mailbox size is not big and both servers are in same datacenter.
Need urgent help pls....

Hi,
Here are the general steps for troubleshooting mailbox moves:
1. If the move request didn't complete, view the Move Request Statistics.
2. If the move request completed with errors, view the move report.
3. View the Event log on the Client Access server running the instance of the Microsoft Exchange Mailbox Replication service that's processing the failed move request.
4. use the Exchange Management Console or the Exchange Management Shell to increase the diagnostic logging levels on the Client Access server for the Mailbox Move and Service categories of the MSExchange Mailbox Replication service.
For more detailed information about general steps for troubleshooting mailbox moves, you can refer to the article below:
http://technet.microsoft.com/en-us/library/dd638094(v=exchg.141).aspx
Additionally, in order to narrow down the cause, I’d like to confirm the following information:
1. Are the problematic target mailboxes in the same database?
2. Is there a time boundary? After that, you cannot move mailboxes:
http://social.technet.microsoft.com/Forums/en-US/90403f75-e530-478a-ab68-27823b730f68/exchange-2013-batch-to-migrate-users-from-2010-database-is-hung-at-syncing-after-a-disaster?forum=exchangesvrdeploy
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Angela
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