Disable the Upgrade to version four nag in Really Simple SSL on your child site.
Snippet Type
Execute on Child Sites
Snippet
$option_name = 'rsssl_upgraded_to_four_dismissed' ;
$new_value = '1' ;
if ( get_option( $option_name ) !== false ) {
// The option already exists, so we just update it.
update_option( $option_name, $new_value );
} else {
// The option hasn't been added yet. We'll add it with $autoload set to 'no'.
$deprecated = null;
$autoload = 'no';
add_option( $option_name, $new_value, $deprecated, $autoload );
}