CIP Security session error: 0x090A Certificate Unknown

Possible cause and solution:
  • Communication was not established because the certificate presented is not trusted and is not valid 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. Please review logs, network setup, and communications data for unusual activity. If this error persists, contact the security administrator or technical support.
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