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How to access my website at my dev machine without getting: Secure Connection Failed

Firefox Sekretess och säkerhet
jscher2000 -... besvarat
msamy.earth
msamy.earth

When I try to access my website via https I got the following error:

================================

An error occurred during a connection to api.couriercloud.tk. You have received an invalid certificate. Please contact the server administrator or email correspondent and give them the following information: Your certificate contains the same serial number as another certificate issued by the certificate authority. Please get a new certificate containing a unique serial number. (Error code: sec_error_reused_issuer_and_serial) 

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem. Alternatively, use the command found in the help menu to report this broken site.
================================

the used certificate is a self-signed one.

When I try to access my website via https I got the following error: ============================================ An error occurred during a connection to api.couriercloud.tk. You have received an invalid certificate. Please contact the server administrator or email correspondent and give them the following information: Your certificate contains the same serial number as another certificate issued by the certificate authority. Please get a new certificate containing a unique serial number. (Error code: sec_error_reused_issuer_and_serial) The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. Please contact the website owners to inform them of this problem. Alternatively, use the command found in the help menu to report this broken site. ============================================ the used certificate is a self-signed one.

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jscher2000 - Support Volunteer
jscher2000 - Support Volunteer

Oops, your post came through twice. I replied here: https://support.mozilla.org/en-US/questions/978899