When trying to authenticate to a StoreFront server using the StoreFront URL you get the error:
An SSL connection to the server couldn't be established because the server's certificate was not trusted.
1. Obtain the root certificate in PEM format.
Tip: If you cannot find a certificate in this format, use the openssl utility to convert a certificate in CRT format to a .pem file.
2. As the user who installed the package (usually root):
Receiver needs root certificate to verify the signature of Certificate Authority on the server certificate