CIP Security session error: 0x090C Unknown CA
Unable to establish communication because the certificate presented includes a certificate authority that is not verifiable or is not trusted so it cannot be used for CIP Security authentication purposes.
Verify that the correct device is addressed and that the project configuration includes devices supported by the CIP Security Policy.
Review logs, network setup, and communication data for unusual activity.
If this error persists, contact the security administrator or technical support.
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