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Navigating SSO Integration Issues with FortiGate SSL VPN and Microsoft Entra

Microsoft Entra SSO integration with FortiGate SSL VPN: Troubleshooting Connection Issues

Introduction

In this blog post, we will discuss the issues faced by a user who is unable to connect via FortiClient vpn version 7.2.x.x but can connect successfully with FortiClient vpn client version 7.0.x.x. We will explore the possible reasons for this behavior and provide troubleshooting steps to resolve the issue.

Issue Description

The user is experiencing issues while connecting to the SSL VPN via Azure ID with SAML authentication using FortiClient vpn version 7.2.x.x. The connection fails in the first attempt, but when the user tries again in the second or third attempt, they are able to connect without the 2FA prompt. This issue is not consistent and occurs only sometimes.

Possible Causes

Based on the information provided, there could be several reasons for this behavior:

1. FortiClient vpn version 7.2.x.x might have a bug or configuration issue that causes the connection to fail in the first attempt.

2. The Azure FortiGate SSL VPN application might have a configuration issue that prevents successful connections with FortiClient vpn version 7.2.x.x.

3. There could be an issue with the user’s account or credentials, preventing them from successfully connecting to the SSL VPN.

Troubleshooting Steps

To troubleshoot this issue, follow these steps:

1. Check FortiClient vpn version compatibility: Ensure that the FortiClient vpn version 7.2.x.x is compatible with the Azure FortiGate SSL VPN application. Check the FortiClient documentation for any known issues or compatibility concerns.

2. Verify Azure FortiGate SSL VPN configuration: Review the Azure FortiGate SSL VPN configuration to ensure it is properly set up and configured for SAML authentication. Check for any misconfigured settings or missing information that might be causing connection failures.

3. Check user credentials and account settings: Verify that the user’s account credentials and settings are correct and up-to-date. Ensure that the user’s account is active and has access to the required resources.

4. Test with different FortiClient versions: Try connecting with different FortiClient vpn versions, such as version 7.0.x.x, to determine if the issue is specific to a particular version or if it is a more widespread problem.

5. Check network connectivity: Ensure that the user’s network connection is stable and functional. Network issues can cause connection failures, so it is essential to verify that the user’s network is properly configured and operational.

6. Monitor FortiClient logs: Review the FortiClient logs to identify any errors or issues that might be causing the connection failures. Check for any error messages or warnings related to SAML authentication or SSL VPN connections.

7. Contact Azure support: If none of the above steps resolve the issue, contact Azure support for further assistance. They can provide additional troubleshooting steps and help you identify the root cause of the problem.

Conclusion

In this blog post, we have explored an issue where a user is unable to connect via FortiClient vpn version 7.2.x.x but can connect successfully with FortiClient vpn client version 7.0.x.x. We have identified possible causes for this behavior and provided troubleshooting steps to resolve the issue. By following these steps, you should be able to identify and resolve the issue, ensuring successful connections to the SSL VPN via Azure ID with SAML authentication.