During an attempt to establish a secure connection, the initiating machine could not verify the issuing certificate authority (CA) for the certificate provided by the partner machine.
The secure connection fails.
Determine whether the CA can be trusted and take one of the following actions:
If the CA on the partner machine can be trusted, import the CA record to the initiating machine, so that the initiating machine can accept the certificate.
If the certificate on the partner machine is expired, or the CA cannot be trusted, install a valid certificate from a trusted CA on the partner machine.