This error comes up when attempting to submit a job from z/OSMF.
When opening the z/OSMF console, the browser may show Connection Not Secure, near the URL.
One of the possible causes is an issue with Java version.
Updating Java version 1.8.0_371 to version 1.8.0_421 resolves this issue.
Related issue: z/OSMF browser error NET::ERR_CERT_COMMON_NAME_INVALID