Unfortunately, the ! character at the beginning the the line in ca-certificates.conf is just for blacklisting ca certificates from being imported into the system store, it's not really a backlist that can be used by a crypto library.
Unfortunately, the ! character at the beginning the the line in ca-certificates .conf is just for blacklisting ca certificates from being imported into the system store, it's not really a backlist that can be used by a crypto library.