Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsThe right alternative to LDAP depends on what an application actually needs. If it can use a modern sign-in protocol, integrate it with an identity provider through OpenID Connect (OIDC) or SAML. If it must continue making LDAP binds or directory queries, retain a compatible LDAP endpoint—such as a managed domain or a service-specific LDAP interface—and verify that it supports the operations and directory behavior the application requires. A proxy that handles other protocols is not automatically an LDAP replacement.
Start with what the application does with LDAP
“Uses LDAP” can mean a simple username-and-password bind, searching for user attributes, checking group membership, or writing directory data. Those requirements lead to different architectures. Before choosing a product, document the application’s actual behavior and where it runs.
- Authentication: Does the app bind to LDAP to validate a password, or can it redirect users to an identity provider?
- Directory reads: Which attributes, groups, or directory paths does it search? Does authorization depend on those results?
- Directory writes: Does it create or modify users, passwords, group membership, or other LDAP attributes?
- AD-specific assumptions: Does it rely on particular organizational units (OUs), domain features, or less common Active Directory behavior?
- Network and identity design: Where is the app hosted, how can it reach an identity service, and how are identities and groups synchronized?
Replacing an authentication endpoint does not, by itself, move directory data or reproduce the application’s authorization rules. Treat those as separate migration concerns.
Compare the main alternatives
| Approach | Best fit | What to verify |
|---|---|---|
| Direct OIDC or SAML integration | An application that already supports a modern protocol or can be updated. | Application configuration or code changes, claim and group mapping, and sign-in and authorization behavior. |
| Microsoft Entra Domain Services | An LDAP- or AD-dependent app that can connect to a managed domain. | Network access, identity synchronization, required AD behavior, and whether the app needs directory writes. |
| Okta LDAP Interface | A legacy LDAP app whose operations fit Okta’s documented interface. | Supported commands and limitations for the specific app; do not assume complete Active Directory behavior. |
| Identity broker such as Keycloak or Auth0 | An app able to use protocols the broker supports, or an architecture needing enterprise identity connections. | Protocol compatibility, deployment and operational needs, and the requirements of the intended integration. |
| Another bridge or proxy | An app that cannot be modernized immediately and whose authentication protocol is explicitly supported by the bridge. | Protocol support and compatibility with the app’s authentication flow. Microsoft Entra application proxy does not accept LDAP. |
When modern protocol integration is the better path
For an application that supports modern identity, direct OIDC or SAML integration is usually the cleanest direction to assess. The application authenticates through an identity provider rather than relying on an LDAP bind. The integration still needs careful configuration: map the claims or groups the application uses, then test both sign-in and authorization.
Microsoft recommends considering applications that already use SAML or OpenID Connect first when planning a migration to Microsoft Entra ID. Its guidance describes OAuth 2.0, OIDC, or WS-Federation line-of-business apps as candidates for app registrations, while custom SAML 2.0 or WS-Federation apps can be integrated as enterprise applications. The appropriate setup depends on the application’s protocol and design; see Microsoft’s application-migration stages.
Identity brokers can help when an application supports a protocol the broker can provide. Keycloak documents OAuth 2.0, OIDC, and SAML support for applications whose technology stacks support those protocols. Auth0 documents enterprise identity-provider connections that include Active Directory/LDAP, OIDC, and SAML. These are distinct product capabilities, not a guarantee that every application’s LDAP behavior can be reproduced through either service. Review the relevant documentation for Keycloak 23.0.7 and Auth0 enterprise identity providers.
When the app must keep using LDAP
Microsoft Entra Domain Services
Microsoft Entra Domain Services provides LDAP and other AD DS-related capabilities, including domain join, Group Policy, Kerberos, and NTLM, for workloads connected to its virtual network. It synchronizes identity information from Microsoft Entra ID. This is a managed-domain option for applications that need LDAP or related domain functionality, but it is not a drop-in fit for every dependency: confirm network reachability, synchronization design, required directory operations, and any need to write LDAP attributes.
Microsoft’s architecture guidance distinguishes this managed-domain approach from application proxying. See Microsoft’s LDAP authentication architecture guidance and its cloud-first identity guidance.
Rank #3
Okta LDAP Interface
Okta documents an LDAP Interface that translates LDAP commands into Okta API calls. That makes it a possible compatibility path for certain legacy LDAP applications, but the application’s specific commands and expectations must fit the interface. Check Okta’s current documentation and test the app’s binds, searches, attribute use, and group behavior before planning a migration: Set up and manage the LDAP Interface.
Why Microsoft Entra application proxy is not an LDAP replacement
Microsoft Entra application proxy supports Kerberos and header-based authentication, but Microsoft lists LDAP among the protocols it does not support. It therefore cannot serve as an LDAP endpoint for an application that binds to LDAP. Microsoft’s secure hybrid access guidance describes supported integrations and their protocol limits.
For LDAP-bound applications, Microsoft’s architecture guidance describes alternatives such as provisioning users and groups back to on-premises Active Directory or redirecting the application to Entra Domain Services. The right choice depends on whether the app needs reads only, requires writes, depends on on-premises AD behavior, and can reach the selected directory.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Plan and validate the migration
- Inventory the application. Record its current authentication method, LDAP searches and writes, required attributes, group or role dependencies, AD-specific assumptions, and network location.
- Check for a modernization route. Ask the vendor about an update or determine whether the application can be changed to support OIDC or SAML. Microsoft describes migration to modern protocols as the typical long-term direction when feasible.
- Select a compatibility path only after checking operations. For software that cannot change, confirm that a managed LDAP endpoint or bridge supports the required binds, searches, writes, and directory behavior. Do not treat Entra application proxy as an LDAP endpoint.
- Test outside production where practical. Use a test instance or tenant to compare authentication behavior, validate claim or group mapping, and check that authorization matches expectations. Microsoft specifically recommends testing and verifying synchronized group membership before production cutover.
- Track anything unresolved. Document dependencies that remain on on-premises AD, require write access, or rely on hard-coded OUs or obscure AD functions. Those may call for continued AD write capability, a bridge, application changes, or retirement rather than a simple endpoint switch.
Microsoft cautions that LDAP writes, hard-coded OU locations, and less common AD functionality can constrain migration. Its cloud-first identity guidance is relevant when assessing those dependencies.
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