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Power Platform Community / Forums / Power Apps - Connector Development / How to Authenticate On...
Power Apps - Connector Development
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How to Authenticate On-Premises Gateway Using API Key?

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Posted on by VK-22011302-0

I am trying to authenticate an on-premises gateway using an API key. However, I have selected "No Authentication," and as a result, the connector is not working.

The web application is secured using FortiClient, which might be affecting the setup. How can I properly configure the gateway to use an API key for authentication while working with a connector? Are there additional steps required to make it compatible with FortiClient security?

Any guidance or troubleshooting steps would be greatly appreciated.

Thank you!

Categories:
Authentication
  • Suggested answer
    Jon Unzueta Profile Picture
    Jon Unzueta 759 on at
    How to Authenticate On-Premises Gateway Using API Key?
     
    You're running into a known limitation with Power Platform's on-premises data gateway and custom connectors when trying to use API key authentication—especially in environments secured by tools like FortiClient.
     
     
     Recommended Workarounds
     
    1. Use a Custom Header Instead of API Key Auth
    If you control the API:
    • Change the connector to use "No Authentication".
    • Manually add the API key as a custom header in each request (e.g., x-api-key).
    • This bypasses the unsupported API key auth type.
    2. Use Azure Relay or Azure API Management
    If FortiClient or network policies block direct access:
    • Use Azure Relay to securely expose your on-prem API without opening firewall ports.
    • Or use Azure API Management as a proxy to handle authentication and routing.
    3. Test with HTTP + Azure AD Connector
    If your API can support OAuth2:
    • Use the HTTP with Azure AD connector, which supports the gateway 
    • This requires registering your API in Azure AD and using client credentials flow.
    🧪 Troubleshooting Tips
    • Check FortiClient logs for blocked or redirected traffic.
    • Use Postman from the same machine as the gateway to test API access.
    • Enable gateway logs to trace request failures.
     If the response is helpful to you, a like or mark as the correct solution. thank you so much!

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