SharePoint 2016 High-trust App: Getting 401 Unauthorized And “Azure Access Control Service Is Unavailable”

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Introduction

Deploying a high-trust SharePoint 2016 app in a non-dev environment can be a challenging task. One of the common issues encountered is the "401 Unauthorized" error. In this article, we will discuss the possible causes and solutions for this issue, as well as the "Azure Access Control Service is unavailable" error.

Environment Overview

Our environment consists of:

  • SharePoint 2016 Server
  • Remote Azure Active Directory (AAD) for authentication
  • High-trust SharePoint 2016 app

Common Causes of 401 Unauthorized Error

The "401 Unauthorized" error in SharePoint 2016 high-trust apps can be caused by several factors, including:

  • Certificate Issues: The certificate used for authentication is not properly configured or is not trusted by the SharePoint server.
  • AAD Configuration: The Azure Active Directory configuration is not set up correctly, leading to authentication failures.
  • App Registration: The high-trust app is not registered correctly in Azure AD, resulting in authentication errors.
  • SharePoint Server Configuration: The SharePoint server configuration is not set up correctly, leading to authentication failures.

Certificate Issues

Certificate issues are a common cause of the "401 Unauthorized" error in SharePoint 2016 high-trust apps. To troubleshoot certificate issues, follow these steps:

  1. Verify Certificate Configuration: Ensure that the certificate used for authentication is properly configured and trusted by the SharePoint server.
  2. Check Certificate Expiration: Verify that the certificate has not expired and is still valid.
  3. Check Certificate Chain: Ensure that the certificate chain is complete and trusted by the SharePoint server.

AAD Configuration

AAD configuration issues can also cause the "401 Unauthorized" error. To troubleshoot AAD configuration issues, follow these steps:

  1. Verify AAD Configuration: Ensure that the Azure Active Directory configuration is set up correctly.
  2. Check AAD Tenant: Verify that the AAD tenant is correctly configured and registered.
  3. Check AAD App Registration: Ensure that the high-trust app is registered correctly in Azure AD.

App Registration

App registration issues can also cause the "401 Unauthorized" error. To troubleshoot app registration issues, follow these steps:

  1. Verify App Registration: Ensure that the high-trust app is registered correctly in Azure AD.
  2. Check App Permissions: Verify that the app has the necessary permissions to access SharePoint resources.
  3. Check App Configuration: Ensure that the app configuration is set up correctly.

SharePoint Server Configuration

SharePoint server configuration issues can also cause the "401 Unauthorized" error. To troubleshoot SharePoint server configuration issues, follow these steps:

  1. Verify SharePoint Server Configuration: Ensure that the SharePoint server configuration is set up correctly.
  2. Check SharePoint Server Settings: Verify that the SharePoint server settings are correctly configured.
  3. Check SharePoint Server Certificates: Ensure that the SharePoint server certificates are correctly configured.

Troubleshooting Steps

To troubleshoot the "401 Unauthorized" error in SharePoint 2016 high-trust apps, follow these steps:

  1. Check Event Logs: Check the event logs on the SharePoint server for any authentication-related errors.
  2. Check SharePoint Server Logs: Check the SharePoint server logs for any authentication-related errors.
  3. Check AAD Logs: Check the AAD logs for any authentication-related errors.
  4. Verify Certificate Configuration: Verify that the certificate used for authentication is properly configured and trusted by the SharePoint server.
  5. Verify AAD Configuration: Verify that the Azure Active Directory configuration is set up correctly.
  6. Verify App Registration: Verify that the high-trust app is registered correctly in Azure AD.

Conclusion

The "401 Unauthorized" error in SharePoint 2016 high-trust apps can be caused by several factors, including certificate issues, AAD configuration issues, app registration issues, and SharePoint server configuration issues. By following the troubleshooting steps outlined in this article, you can identify and resolve the root cause of the issue and deploy your high-trust SharePoint 2016 app successfully.

Azure Access Control Service Unavailability

The "Azure Access Control Service is unavailable" error can be caused by several factors, including:

  • AAD Configuration: The Azure Active Directory configuration is not set up correctly, leading to authentication failures.
  • App Registration: The high-trust app is not registered correctly in Azure AD, resulting in authentication errors.
  • SharePoint Server Configuration: The SharePoint server configuration is not set up correctly, leading to authentication failures.

Troubleshooting Steps for Azure Access Control Service Unavailability

To troubleshoot the "Azure Access Control Service is unavailable" error, follow these steps:

  1. Verify AAD Configuration: Ensure that the Azure Active Directory configuration is set up correctly.
  2. Check AAD Tenant: Verify that the AAD tenant is correctly configured and registered.
  3. Check AAD App Registration: Ensure that the high-trust app is registered correctly in Azure AD.
  4. Verify SharePoint Server Configuration: Ensure that the SharePoint server configuration is set up correctly.
  5. Check SharePoint Server Settings: Verify that the SharePoint server settings are correctly configured.
  6. Check SharePoint Server Certificates: Ensure that the SharePoint server certificates are correctly configured.

Conclusion

Q: What is a high-trust SharePoint 2016 app?

A: A high-trust SharePoint 2016 app is a type of app that is deployed in a SharePoint 2016 environment and uses a high-trust authentication model to authenticate users. This type of app is typically used for line-of-business applications that require high levels of security and authentication.

Q: What are the benefits of using a high-trust SharePoint 2016 app?

A: The benefits of using a high-trust SharePoint 2016 app include:

  • Improved security: High-trust apps use a more secure authentication model that reduces the risk of unauthorized access to SharePoint resources.
  • Increased flexibility: High-trust apps can be deployed in a variety of environments, including on-premises and cloud-based environments.
  • Better integration: High-trust apps can be integrated with other SharePoint features and services, such as workflows and business intelligence.

Q: What are the common causes of the "401 Unauthorized" error in SharePoint 2016 high-trust apps?

A: The common causes of the "401 Unauthorized" error in SharePoint 2016 high-trust apps include:

  • Certificate issues: The certificate used for authentication is not properly configured or is not trusted by the SharePoint server.
  • AAD configuration issues: The Azure Active Directory configuration is not set up correctly, leading to authentication failures.
  • App registration issues: The high-trust app is not registered correctly in Azure AD, resulting in authentication errors.
  • SharePoint server configuration issues: The SharePoint server configuration is not set up correctly, leading to authentication failures.

Q: How do I troubleshoot the "401 Unauthorized" error in SharePoint 2016 high-trust apps?

A: To troubleshoot the "401 Unauthorized" error in SharePoint 2016 high-trust apps, follow these steps:

  1. Check event logs: Check the event logs on the SharePoint server for any authentication-related errors.
  2. Check SharePoint server logs: Check the SharePoint server logs for any authentication-related errors.
  3. Check AAD logs: Check the AAD logs for any authentication-related errors.
  4. Verify certificate configuration: Verify that the certificate used for authentication is properly configured and trusted by the SharePoint server.
  5. Verify AAD configuration: Verify that the Azure Active Directory configuration is set up correctly.
  6. Verify app registration: Verify that the high-trust app is registered correctly in Azure AD.

Q: What are the common causes of the "Azure Access Control Service is unavailable" error in SharePoint 2016 high-trust apps?

A: The common causes of the "Azure Access Control Service is unavailable" error in SharePoint 2016 high-trust apps include:

  • AAD configuration issues: The Azure Active Directory configuration is not set up correctly, leading to authentication failures.
  • App registration issues: The high-trust app is not registered correctly in Azure AD, resulting in authentication errors.
  • SharePoint server configuration issues: The SharePoint server configuration is not set up correctly, leading to authentication failures.

Q: How do I troubleshoot the "Azure Access Control Service is unavailable" error in SharePoint 2016 high-trust apps?

A: To troubleshoot the "Azure Access Control Service is unavailable" error in SharePoint 2016 high-trust apps, follow these steps:

  1. Verify AAD configuration: Ensure that the Azure Active Directory configuration is set up correctly.
  2. Check AAD tenant: Verify that the AAD tenant is correctly configured and registered.
  3. Check AAD app registration: Ensure that the high-trust app is registered correctly in Azure AD.
  4. Verify SharePoint server configuration: Ensure that the SharePoint server configuration is set up correctly.
  5. Check SharePoint server settings: Verify that the SharePoint server settings are correctly configured.
  6. Check SharePoint server certificates: Ensure that the SharePoint server certificates are correctly configured.

Q: What are some best practices for deploying high-trust SharePoint 2016 apps?

A: Some best practices for deploying high-trust SharePoint 2016 apps include:

  • Use a secure authentication model: Use a high-trust authentication model to authenticate users and reduce the risk of unauthorized access to SharePoint resources.
  • Verify certificate configuration: Verify that the certificate used for authentication is properly configured and trusted by the SharePoint server.
  • Verify AAD configuration: Verify that the Azure Active Directory configuration is set up correctly.
  • Verify app registration: Verify that the high-trust app is registered correctly in Azure AD.
  • Test thoroughly: Test the high-trust app thoroughly to ensure that it is working correctly and securely.

Conclusion

In this article, we have discussed the common causes of the "401 Unauthorized" error and the "Azure Access Control Service is unavailable" error in SharePoint 2016 high-trust apps. We have also provided troubleshooting steps and best practices for deploying high-trust SharePoint 2016 apps. By following these steps and best practices, you can ensure that your high-trust SharePoint 2016 app is deployed securely and correctly.