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support/power-platform/power-automate/desktop-flows/could-not-establish-trust-relationship-ssl-tls-secure-channel.md

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---
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title: Could not establish trust relationship for the SSL or TLS secure channel
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title: Could Not Establish Trust Relationship for the SSL or TLS Secure Shannel
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description: Provides a workaround to allow users with invalid certificates to use certain actions in Power Automate for desktop.
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ms.reviewer: nimoutzo
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ms.date: 05/06/2025
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ms.date: 05/13/2025
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ms.custom: sap:Desktop flows\PAD Runtime - Action execution (not browser or UI)
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---
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# "Could not establish trust relationship for the SSL/TLS secure channel" error
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## Symptoms
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Actions in Power Automate for desktop, like [Invoke web service](/power-automate/desktop-flows/actions-reference/web#invokewebservicebase), or [Get password from CyberArk](/power-automate/desktop-flows/actions-reference/cyberark#getpasswordbase), might fail during runtime with the following error:
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Actions in Power Automate for desktop, like [Invoke web service](/power-automate/desktop-flows/actions-reference/web#invokewebservicebase) or [Get password from CyberArk](/power-automate/desktop-flows/actions-reference/cyberark#getpasswordbase), might fail during runtime with the following error:
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> System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.
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2. Companies that use package inspection to audit their network infrastructure might not allow users to sign in, as their Certificate Revocation List (CRL) might not have been defined or is unreachable.
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3. Tools like Fiddler might install a self-signed certificate on the system, which displays a revocation status of **Unknown**. Therefore, when the registry key is set to **Comprehensive**, the error might occur.
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3. Tools like Fiddler might install a self-signed certificate on the system with an **Unknown** revocation status. Therefore, when the registry key is set to **Comprehensive**, the error might occur.
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## Workaround
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