docker-machine on mac does not work with docker-engine protected by self-create CA

I installed docker-machine on a mac and have a linux box(jumper) installed with docker engine. The linux docker-engine is protected by a self-created CA, which had been added to mac’s keychain store and set as “trusted”.

“curl https://jumper:2376/v1.15/version” runs without problem:
{“Version”:”1.13.0″,”ApiVersion”:”1.25″,”MinAPIVersion”:”1.12″,”GitCommit”:”49bf474″,”GoVersion”:”go1.7.3″,”Os”:”linux”,”Arch”:”amd64″,”KernelVersion”:”3.13.0-46-generic”,”BuildTime”:”2017-01-17T09:50:17.871838842+00:00″}

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    Unable to query docker version: Get https://jumper:2376/v1.15/version: x509: certificate signed by unknown authority

    Docker for Mac, version 1.13.0, build 49bf474
    docker-machine version 0.9.0, build 15fd4c7
    linux docker-engine: Version: 1.13.0

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