Mailbox migration failed from on-prem to cloud o365

Question

We are facing an issue with mailbox migration failing from on-prem to cloud o365. I am sharing the screenshots-

Answer 1

To resolve this issue, you can try the following:

• Increase the send timeout value on the binding. This can be done by editing the Web.config file on your on-premises Exchange servers.
• Check the network connection between your on-premises Exchange servers and Exchange Online. Make sure that the connection is not saturated and that there are no firewall rules that are blocking the traffic.
• If the mailbox that is being migrated is very large, you can try splitting it into smaller mailboxes.
• If the mailbox contains a lot of items that are being synchronized with Exchange Online, you can try increasing the synchronization interval.

If you are still having problems after trying these steps, you can contact Microsoft support for help.

Here are the specific steps on how to increase the send timeout value on the binding:

1. Open the Web.config file on one of your on-premises Exchange servers.
2. Locate the following section:

<binding name="mrsproxy"
        port="443"
        protocol="https"
        bindingInformation="https://exsync.contoso.com/EWS/mrsproxy.svc" />

1. Change the value of the SendTimeout attribute to a higher value, such as 300 seconds.
2. Save the file.

Once you have made these changes, try migrating the mailbox again.

Answer 2

The reason might be caused by the timeout value for the MRS Proxy Service is not set high enough for the operations being performed.