Lithnet Access Manager
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v3.0
v3.0
  • Home
  • How does Lithnet Access Manager help prevent lateral movement?
  • Access Manager Editions
  • Licensing
  • What's new in Access Manager v3
  • Change log
  • Installation
    • Getting started
    • System Requirements
    • Downloads
    • Upgrading from Access Manager v1
    • Upgrading from Access Manager v2
      • Considerations for migrating from Access Manager v2
    • Installing the Access Manager Server
      • Creating a service account for the Access Manager Service
      • SQL installation options
      • Installing the Access Manager Service
      • High availability options
        • Load balancing Access Manager
    • Installing the Access Manager Agent
      • Enabling agent support on the AMS server
      • Installing the Access Manager Agent on Windows
      • Installing the Access Manager Agent on Linux
      • Installing the Access Manager Agent on macOS
  • Configuration
    • Setting up Authentication
      • Setting up authentication with ADFS
      • Setting up authentication with Microsoft Entra ID
      • Setting up authentication with Okta
      • Setting up smart card authentication
      • Setting up integrated windows authentication
    • Deploying Features
      • Setting up RapidLAPS
      • LAPS
        • Setting up Microsoft LAPS for Active Directory
        • Setting up Microsoft LAPS for Entra
        • Setting up Lithnet LAPS
      • Just-in-time Authentication (JIT)
        • Setting up JIT for computers
        • Setting up JIT for roles
      • Setting up BitLocker access
        • Setting up access to BitLocker keys stored in Active Directory
        • Setting up BitLocker recovery key backup and access using the Access Manager Agent
    • Importing authorization rules
      • Import Microsoft LAPS permissions from Active Directory
      • Importing BitLocker permissions from Active Directory
      • Importing local administrator group membership from domain-joined Windows devices
      • Import mappings from a CSV file
      • Performing an offline discovery of local admins
  • Help and support
    • Frequently asked Questions
    • Troubleshooting
    • Quick start guides
      • Getting started with Windows LAPS and Lithnet Access Manager
      • Getting started with Windows LAPS for Active Directory
      • Getting started with Windows LAPS for Microsoft Entra
      • Getting started with RapidLAPS
    • Product lifecycle
    • Choosing between the Lithnet and Microsoft agent for LAPS
    • Support Articles
      • KB000001: The Access Manager Agent cannot connect and logs a token-validation-failed error
      • KB000002: Users retain their admin rights after their JIT period expires
      • KB000003: Configuring the Access Manager Agent to manage an account other than 'root' on Linux
      • KB000004: Creating a log file to troubleshoot installation issues with the Access Manager Service
      • KB000005: Access Manager stops working after applying the November 2022 Windows update
      • KB000006: Migrating the Access Manager Database
      • KB000007: Adding JIT groups via Group Policy doesn't work with NTLM Disabled
      • KB000008: AMS is unable to JIT into privileged groups such as Domain Admins
      • KB000009: Access Manager may return an out-of-date LAPS password, or no password at all
      • KB000010: The Access Manager agents fail to register on macOS 15 (Sequoia)
      • KB000011: Users report delays in obtaining just-in-time access via AD
      • KB000012: Troubleshooting Windows authentication in the Access Manager Web App
      • KB000013: Access Manager cannot be installed on Windows Server 2016 with TLS 1.0 disabled
    • Advanced help topics
      • Creating an Entra app registration or Access Manager
      • Setting up agent policies
      • Managing word lists
      • Password history retention
      • Ports and traffic flows
      • Internet access requirements
      • Access evaluation in Access Manager Service (AMS)
      • Recovering from a lost encryption certificate
      • Script-based authorization
      • Customized auditing with PowerShell notification channels
      • Variables available in audit notification channels
      • Setting up audit templates
      • Backup and Restore
      • Event ID reference
      • Group policy configuration
    • PowerShell reference
      • Add-AmsDeviceRegistrationKeyGroup
      • Add-AmsGroupMember
      • Add-AmsIdpClaimMapping
      • Clear-AmsIdpClaimMapping
      • Export-AmsServerDiagnostics
      • Get-AmsActiveDirectoryJitOptions
      • Get-AmsActiveDirectoryJitGroupCreationRule
      • Get-AmsComputerAuthorizationRule
      • Get-AmsDevice
      • Get-AmsDeviceRegistrationKey
      • Get-AmsFveRecoveryKey
      • Get-AmsGroup
      • Get-AmsGroupMembers
      • Get-AmsHostConfig
      • Get-AmsIdpClaimMapping
      • Get-AmsJitSchedulerJob
      • Get-AmsLocalAdminPassword
      • Get-AmsLocalAdminPasswordHistory
      • Get-AmsRoleAuthorizationRule
      • Get-AmsServiceConfig
      • New-AmsActiveDirectoryJitGroupCreationRule
      • New-AmsComputerAuthorizationRule
      • New-AmsDeviceRegistrationKey
      • New-AmsGroup
      • New-AmsRoleAuthorizationRule
      • Remove-AmsActiveDirectoryJitGroupCreationRule
      • Remove-AmsComputerAuthorizationRule
      • Remove-AmsDevice
      • Remove-AmsDeviceRegistrationKey
      • Remove-AmsDeviceRegistrationKeyGroup
      • Remove-AmsGroup
      • Remove-AmsGroupMember
      • Remove-AmsJitSchedulerJob
      • Remove-AmsRoleAuthorizationRule
      • Set-AmsActiveDirectoryJitGroupCreationRule
      • Set-AmsActiveDirectoryJitOptions
      • Set-AmsComputerAuthorizationRule
      • Set-AmsDevice
      • Set-AmsDeviceRegistrationKey
      • Set-AmsGroup
      • Set-AmsHostConfig
      • Set-AmsRoleAuthorizationRule
      • Set-AmsServiceConfig
    • Application help pages
      • Host configuration page
      • App Configuration
        • AMS License configuration page
        • Authentication configuration page
        • Email configuration page
        • Rate limit configuration page
        • IP Address detection configuration page
        • User interface configuration page
        • Auditing page
        • Security page
        • Database configuration page
      • Access Manager Agent
        • Access Manager Agent - Agent registration page
        • Agent Policies
          • Access Manager Agent - Windows polices page
          • Access Manager Agent - macOS polices page
          • Access Manager Agent - Linux polices page
          • Access Manager Agent - Legacy AMSv2 policies page
        • Access Manager Agent - Password settings page
        • Access Manager Agent - Devices page
        • Access Manager Agent - Groups page
      • Directory Configuration
        • Active Directory configuration page
          • Microsoft LAPS configuration page
          • Lithnet LAPS configuration page (Active Directory)
          • Just-in-time access configuration page
          • BitLocker configuration page
        • Microsoft Entra configuration page
      • Authorization Rules
        • Computer authorization rules page
        • Role authorization rules page
      • Effective access page
    • Getting Support
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On this page
  • Summary
  • Cause
  • 1. Incorrect SPN
  • 2. Mismatched encryption types
  • 3. Use of CNAME records

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  1. Help and support
  2. Support Articles

KB000012: Troubleshooting Windows authentication in the Access Manager Web App

PreviousKB000011: Users report delays in obtaining just-in-time access via ADNextKB000013: Access Manager cannot be installed on Windows Server 2016 with TLS 1.0 disabled

Last updated 3 months ago

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Summary

Incorrect configuration of Windows authentication can cause users to be trapped in an authentication loop. This prevents them from accessing the web application.

Cause

There are several possible causes for Windows authentication not working.

1. Incorrect SPN

The hostname that the user types into their address bar must be registered as an SPN on the service account in Active Directory. The SPN must be in the format of HTTP/hostname where hostname is the fully qualified host name that the user is entering into their browser.

You can use the `setspn` command to manage SPNs.
    - View a list of SPNs assigned to a service account `setspn -L domain\serviceaccount`
    - View which account an SPN is assigned to `setspn -Q HTTP/hostname`
    - Set the SPN on a service account `setspn -S HTTP/hostname domain\serviceaccount`

2. Mismatched encryption types

Ensure that AES encryption types are enabled for the AMS service account. If you have performed hardening and disabled RC4, enabling AES may be required to ensure that a compatible encryption type can be negotiated.

3. Use of CNAME records

If the user types https://ams.lithnet.io in their address bar, Chrome checks to see if ams.lithnet.io is a CNAME. If it is, rather than requesting a Kerberos ticket for HTTP/ams.lithnet.io, it requests it for the underlying A record target instead. This is typically the machine itself, e.g., HTTP/AMS1.domain.local.

The AMS service performs authentication as the service account, rather than the machine account. As a result, mutual authentication fails.

Possible solutions for this

  • Convert the ams.lithnet.io record to an A record

Chrome-based browsers have a behavior where they .

Use Chrome policy to . However, be aware this will impact all sites using Windows authentication. It should be tested carefully to ensure it doesn't impact other services.

try to authenticate as the target of the CNAME record
disable this behavior