We have an SSL cert from GeoTrust that we cannot import. Whether we use the option to "paste" the cert and key or "file on server" it always ends up with this error:
"Failed to install certificate : Missing or invalid signed SSL certificate : Line 28 does not look like PEM format"
Line 28 of the ssl.cert is: -----END CERTIFICATE-----
I checked and there are no blank spaces in the file, in fact the files have been copied from a plesk machine where both Nginx and Apache were using happily.