Cut-Over Migration Error - TooManyTransientFailureRetriesPermanentException

Question

Hi Guys,

We are moving our on-premises exchange server (2013) mailboxes to Microsoft 365 using the cut-over migration.

while performing the migration I have encountered an error with few of my mailboxes.

I have attached my error below, Please reply me you need any other information regarding this .

Please help with this , thanks in advance.

Error: TooManyTransientFailureRetriesPermanentException: The job encountered too many transient failures (326) and is quitting. The most common failure is ObjectNotFoundException with the hit count 60.

Answer 1

Hi @ Ajay ,

Based on my knowledge, there could be many possible causes, which could be related to the endpoint itself, network environment factors, or specific mailbox content.

If only a few mailboxes report errors, we recommend that you run data repair on their mailboxes before the next migration attempt and dump their information into a PST file to ensure that no errors occur.

 

You can choose the following ways to recover your mailbox:

1. Use the New-MailboxRepairRequest command to repair the corrupted mailbox.
2. Use the New-MoveRequest command to repair the corrupted mailbox. The corrupted mailbox is moved to a new database, which essentially creates a new mailbox that contains the data extracted from the corrupted mailbox. However, in this repair, you may lose data.

 

Additionally, it's a good option to export/import their email data from their on-premises mailbox to .pst file to the appropriate Office 365 mailbox.

To export/import .pst files, please refer to the following articles:

Export or backup email, contacts, and calendar to an Outlook .pst file (microsoft.com)

Import email, contacts, and calendar from an Outlook .pst file (microsoft.com)

 

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread

Answer 2

Please kindly add IP addresses used by Microsoft datacenters to your firewall safe list, then restart the migration batch to check the outcome. For your reference: Office 365 URLs and IP address ranges.

Meanwhile, you can also use Test-MigrationServerAvailability command to test the IMAP endpoint connectivity:

Test-MigrationServerAvailability -Imap -RemoteServer <Your IMAP server> -Port 993

Test-MigrationServerAvailability -Imap -RemoteServer <Your IMAP server> -Port 143

Note: You need to connect to Exchange Online PowerShell first to run the above cmdlets.

Also, check this article for help - TooManyTransientFailureRetriesPermanentException

Please Note: Since the web sites are not hosted by Microsoft, the links may change without notice. Microsoft does not guarantee the accuracy of this information.