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Certificate Authentication Issues After Installation - Mac



How to solve certificate authentication issues after installation in Mac.



※Note: Please make sure to download both certificate files from the links below to allow the program to run properly. 

  1. Click on the link to download the Certificate_1(certificate.crt) /Certificate_2(IntermediateCA.crt) file.

  2. Navigate to the folder where the Certificate file was downloaded.

  3. Double-click the Certificate file, then click Add.

  4. Keychain Access window appears.

  5. Double-click on the Certificate file in the Keychain Access window.

  6. The certificate information appears, then click on Trust to expand its menu.

  7. Under "When using this certificate" set it to Always Trust from the drop-down menu.

  8. Restart the computer.

  9. Start the CLO program. 


※ Note: Should OPTION 1 fail to solve the issue, please use OPTION 2.

  1. Click on the link to download the Certificate_1(certificate.crt) / Certificate_2(IntermediateCA.crt)/ Certificate_3(china-certificate.crt) file.  

  2. Run

  3. Enter "cd" then locate the folder where the file was downloaded in Finder, and drag and drop into


    Possible Errors

    Confirm if there is a space after cd.
    Confirm that the file path to where the downloaded file is located is correct.

  4. Press Enter on the keyboard, input "ls-al" then press Enter on the keyboard again.   

  5. Input
    sudo security add-trusted-cert -d -r trustRoot -k/Library/Keychains/System.keychain certificate.crt

    sudo security add-trusted-cert -d -r trustRoot -k/Library/Keychains/System.keychain IntermediateCA.crt
    sudo security add-trusted-cert -d -r trustRoot -k/Library/Keychains/System.keychain china-certificate.crt
    then press Enter on the keyboard.


  6. Enter the password associated with the Mac account, then start the CLO program.
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  • Avatar

    1. why is a certificate required? - seems like apple has this warning for a reason.
    2. I tried both installations — but no luck. I tried adding all three certificates to my keychain but only one is visible "*"

    Should this be in the login keychain?
    Do you have a video? Perhaps I'm missing something simple

    **I don't mind purchasing it will avoid this certificate issue.

  • Avatar


    system preferences / security & Privacy / General
    bottom half of the screen you will see "Allow apps downloaded from:"
    under the radial button options there was text regarding the installation of clo3d. I selected allow and the software install ran.