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Cannot restore mailbox with error e0000388 - Cannot log on to EWS with the specified credentials

Level 4

Hi all,


When we tried to restore the items from the backup. it have error "Error : e0000388 - Cannot log on to EWS with the specified credentials. Review the resource credentials for the job, and then run the job again."

I checked the system account assigned required permission and not hidden as the document "" . But the error still exist


Best Regards








So you have met all the following requirements from above link?


  1. The account must be an Exchange Full Administrator (Exchange 2003), Exchange Organization Administrator (Exchange 2007), and Organization Management (Exchange 2010) at the top level of Exchange.
  2. The account must be a Domain Administrator. (Recommended, ensure that Domain Admins is a member of the Local Administrator's group on the Exchange Server)
  3. The account must have an active mailbox on the Exchange Server.
  4. The account must have received an e-mail via the mailbox.
  5. The account must have sent an e-mail via the mailbox.
  6. The account must be named so that it is unique within 4 characters. (Refer to the article below for steps to test this).
  7. The account must be visible to the Global Address List, "Unhidden". (See below for instruction on verification of G.A.L. status)
  8. Make sure the default system logon account of Backup Exec and Backup Exec Service Account are the same.

Yes. Checked all of the 8 requirements are met


And also the Role and ThrottlingPolicy as below document:






What is your backup exec and exchange version?

Seem 20.6 will fix the problem

Error from EWS_Output log:

Error              : System.Net.WebException: The remote server returned an error: (401) Unauthorized.
                        at System.Net.HttpWebRequest.GetResponse()
                        at Microsoft.Exchange.Management.SystemConfigurationTasks.ServiceValidatorBase.Invoke()

But my backup exec is version 15, and the exchange is 2013



Anyone have idea?

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Have you read through the 2 articles that @kf2013  posted? 

Hi Marianne

Yes. I checked both link.

The first link is it will fixed in 20.6, but my version is 15. Do version 15 cannot perform GRT restore in exchange 2013

The second link is related to exchange TLS. Our exchange disabled TLS and try the registry but not work

Thansk and Best Regards