In this article:  

• Issue description

• Prerequisites

• Possible causes

• Resolution

• Related topics and articles

• How to reach support

 Issue description   

You may encounter a trust failure error when ADAudit Plus attempts to connect to the Cloud Directory server. This typically prevents successful authentication or communication with Entra ID (formerly Azure AD) services.

 Possible causes   

• A firewall is blocking outbound HTTPS traffic to required Entra ID domains.

• Network proxy configurations may interfere with TLS/SSL certificate validation.

 Prerequisites   

• Ensure administrative access to firewall settings or proxy servers.

• ADAudit Plus must be installed and accessible.

• Internet connectivity is required from the ADAudit Plus server to the Entra ID endpoints.

 Resolution   

 1. Check firewall settings   

If a firewall is in place, ensure the following domains are allowlisted or exempted from filtering and SSL inspection:

• https://login.microsoftonline.com

• https://outlook.office365.com

• https://graph.windows.net

• https://graph.microsoft.com

• https://manage.office.com

 2. Test connectivity   

After applying the necessary firewall exemptions, reattempt the Entra ID configuration or event collection in ADAudit Plus to confirm the issue is resolved.

 Related topics and articles   

• Entra ID (Azure AD) troubleshooting guide

 When and how to reach support   

If the problem persists after following all steps, collect the following logs from the ADAudit Plus server:

• serverout.txt

• catalina.txt

• wrapper.log