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    Nintex Knowledge Base

    Error: "Failed to invoke web service ... Could not establish trust relationship for the SSL-TLS secure channel"

    Summary
    When trying to access a web service via https the following error is received: Failed to invoke web service. The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

    Solution
    1. Navigate to Central Administration > Security > Manage Trust and visually confirm the certificate being used for HTTPS/SSL traffic is added.
    2. Re-import the certificate and re-test the Web Service.

    We would also recommend ensuring all the certificates required by Nintex Workflow are imported into the above page in CA. These can be found listed in our installation guides.

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