The "tls-config" command:

Usage: fossil tls-config [SUBCOMMAND] [OPTIONS...] [ARGS...]

This command is used to view or modify the TLS (Transport Layer
Security) configuration for Fossil.  TLS (formerly SSL) is the
encryption technology used for secure HTTPS transport.

Sub-commands:

   show                            Show the TLS configuration

   remove-exception DOMAIN...      Remove TLS cert exceptions
                                   for the domains listed.  Or if
                                   the --all option is specified,
                                   remove all TLS cert exceptions.