This is a Gauge32 numeric error code returned by a remote invocation made on behalf of the asynchronous job that retrieves and imports the trust certificate referenced by a KeyRing (e.g. a call out to the external VMM). A nonzero value here is the first hard evidence that the last remote call the certificate-import job made — not just a local UCS-side step — is what actually failed. Error code 1 is typically a generic remote failure, while a specific vendor code (e.g. from the vCenter SDK) would point straight at the underlying cause on the VMM side.