This issue has been recently discussed in SSL Certificate error but I think it is actually a bug so I am reporting it here.
Product and version: FileMaker Server 16v3
OS and version: macOS Sierra 10.12.6
Browser and version: Safari 11.0.2
Hardware: iMac Retina 5K 2017
When I try to import certificate issued by DigiCert without an intermediate certificate, FileMaker Pro warns me when connecting that the server's certificate could not be verified.
When I try to import the certificate including the intermediate certificate, I get this error:
Certificate could not be imported:
Config_DBServer_CertificateDialog_ErrorDigiCert SHA2 Secure Server CA
Checked /Library/FileMaker Server/CStore/fmcacerts with the Java keytool and it does contain the current DigiCert Global Root CA with Serial # 08:3B:E0:56:90:42:46:B1:A1:75:6A:C9:59:91:C7:4A.
The intermediate certificate I am trying to import is the current DigiCert SHA2 Secure Server CA, obviously issued by the above mentioned root certificate.
I believe it should just work but it does not.
But even if there is a reason for it to fail, it should give me a meaningful error message instead of the Config_DBServer_CertificateDialog_Error.