Foreman » Packaging

After foreman reinstall I get this warning everytime. This is annoying as I have to clean the certificate from firefox and restart the browser. Can somehow an unique serial number be generated?

Secure Connection Failed

An error occurred during a connection to foreman.test.nu. 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.