Invalid Credentials

The most common p​roblem when encountering this error is that the user name and password specified is not able to access the mailbox. You can verify that the user name and password is correct by testing mailbox access using OWA. If your connector is set to use administrative access, make sure to log in to the mailbox using administrator credentials (since this is what MigrationWiz will do).​

If you have verified that the credentials are correct, enter the credentials into MigrationWiz, and resubmit the mailbox for migration.  It may be possible that the credentials were specified incorrectly.

Over-utilized Resources

If you have verified that your credentials are working properly, it's possible that you may have over-utilized resources. 

The first thing to do is attempt to open your OWA URL from an external network from a system that is not joined to your domain.  If OWA is loaded in a timely manner, check your server resources:

1. Check server CPU usage
2. Check memory usage
3. Check disk I/O usage using performance monitor
4. Check for over-utilization of network

The most common problem encountered is the over-utilization of network. This means that you are attempting to migrate too many mailboxes simultaneously, and do not have enough bandwidth to execute them.  Refer to our article describing network utilization.  Once you have a better understanding of network utilization, configure the correct number of mailboxes you can migrate simultaneously.

TLS Settings

MigrationWiz only supports TLS 1.2 at this time. If the endpoint only allows TLS 1.0, it will need to be updated to allow TLS 1.2.