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Azure AD Connect Error - ArgumentOutOfRangeException: Index was out of range

I am trying to install Azure Ad Connect version 1.5.45.0 on a Windows 2016 Active Directory Server (upgraded windows 2000 domain). The domain is 'local' and am getting the following error: ![77822-image.png][1] [1]: /answers/storage/attachments/77822-image.png The error log shows the following: [07:51:38.084] [ 19] [INFO ] SyncDataProvider: Calling refresh schema on connector local [07:51:47.685] [ 19] [ERROR] ConfigSyncDirectoriesPage: Caught exception while creating the connector for directory: local. Exception Data (Raw): System.Management.Automation.CmdletInvocationException: Failed to retrieve schema.<error><error><incident><connection-result>failed-authentication</connection-result><date>2021-03-15 12:51:47.338</date><server>local</server><cd-error><error-code>1355</error-code> <error-literal>The specified domain either does not exist or could not be contacted.</error-literal> </cd-error></incident></error></error> ---> Microsoft.IdentityManagement.PowerShell.ObjectModel.SynchronizationConfigurationValidationException: Failed to retrieve schema.<error><error><incident><connection-result>failed-authentication</connection-result><date>2021-03-15 12:51:47.338</date><server>local</server><cd-error><error-code>1355</error-code> <error-literal>The specified domain either does not exist or could not be contacted.</error-literal> </cd-error></incident></error></error> at Microsoft.DirectoryServices.MetadirectoryServices.UI.WebServices.MMSWebService.GetSchemaFromDirectory(Connector connector, Boolean commit) and [07:51:47.697] [ 20] [INFO ] Page transition from "Connect Directories" [ConfigSyncDirectoriesPageViewModel] to "Azure AD sign-in" [UserSignInConfigPageViewModel] [07:51:47.699] [ 20] [ERROR] RootWizardPageViewModel: An unhandled exception occurred during a page load. Exception Data (Raw): System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.

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JamesHamil-MSFT avatar image JamesHamil-MSFT ·

Hi, we are investigating your issue and will update you shortly.

Best,
James

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JamesHamil-MSFT avatar image
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JamesHamil-MSFT answered ·

Hi @GranvilleGayle-5493 , This means that the AD connect server is not able to reach the Active directory domain controllers. This could be because of incorrect routing or because you have ports blocked on the network. Make sure traffic is allowed on ports documented at https://docs.microsoft.com/en-us/azure/active-directory/hybrid/reference-connect-ports#table-1---azure-ad-connect-and-on-premises-ad. You can also use port query to check or look for retransmits in a network trace.

If this answer helped you, please mark it as "Verified" so other users may reference it.

Thank you,
James

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GranvilleGayle-5493 avatar image GranvilleGayle-5493 ·

I am actually installing the Azure AD Connect client on a domain controller and I get the same error irrespective of the domain controller I install the client on. I have also turned off the firewall and no difference.

When I run the various AD checks using dcdiag no issues are presented and all the right results come back.

I am thinking that it has to do with the AD being named 'LOCAL' and not another FQDN such as 'DOMAIN.COM'

The xml error shown is as shown below:

Failed to retrieve schema.<error><error><incident><connection-result>failed-authentication</connection-result><date>2021-03-17 03:26:24.044</date><server>LOCAL</server><cd-error><error-code>1355</error-code>
<error-literal>The specified domain either does not exist or could not be contacted.</error-literal>
</cd-error></incident></error></error>

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