---
title: "User ID and domain resolution"
slug: "oas-ag-user-id-and-domain-resolution-3-28"
updated: 2025-07-07T13:31:16Z
published: 2025-07-07T13:31:16Z
canonical: "docs.onespan.com/oas-ag-user-id-and-domain-resolution-3-28"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.onespan.com/llms.txt
> Use this file to discover all available pages before exploring further.

# User ID and domain resolution

To allow users to authenticate with user names in different formats, OneSpan Authentication Server identifies user accounts via the user ID and domain.

[Table: User name resolution in OneSpan Authentication Server](/sec/docs/oas-ag-user-id-and-domain-resolution-3-28#Tab_UsernameResolutionInOAS) provides a comparison overview of the user name resolution methods. For a description of each user name resolution method and user account identification, see :

- [Windows user name resolution](/sec/docs/oas-ag-windows-user-name-resolution-3-28)
- [Active Directory user name resolution](/sec/docs/oas-ag-active-directory-user-name-resolution-3-28)
- [Simple user name resolution](/sec/docs/oas-ag-simple-user-name-resolution-3-28)

| Feature | User Name Resolution Type |
| --- | --- |
|  | Windows | Active Directory | Simple |
| User can authenticate with UPN and SAM account name, even if different. | ✓ | ✓ |  |
| User can authenticate with UPN that includes alternative UPN domain suffixes. | ✓ | ✓ | ✓ |
| Supported where OneSpan Authentication Server is installed on a Windows machine which is a member server of the Windows domain. | ✓ | ✓ | ✓ |
| Supported where the machine on which OneSpan Authentication Server is installed is either not a member server of the Windows domain or running a Linux operating system. |  | ✓ | ✓ |
| Support for Active Directory users. | ✓ | ✓ | ✓ |
| Support for Active Directory or Global Catalog as back-end server. | ✓ | ✓ | ✓ |
| Resolves user name to SAM account name and FQDN. | ✓ | ✓ |  |
| Requires additional configuration of back-end directory information |  | ✓ | ✓ |

![Name resolution with ODBC data store](https://cdn.document360.io/038f59a7-abd0-4c14-9de7-3434d28b49fd/Images/Documentation/Process.ODBC.png)

Figure: Name resolution

![Name resolution with ODBC data store and Active Directory back-end server](https://cdn.document360.io/038f59a7-abd0-4c14-9de7-3434d28b49fd/Images/Documentation/Process.ODBC_with_AD_BE.png)

Figure: Name resolution with Active Directory back-end server