They do. You just don't have their root installed so it gives an error. You can install their root here http://www.cacert.org/index.php?id=3 http://www.cacert.o

They do. You just don't have their root installed so it gives an error. You can install their root here http://www.cacert.org/index.php?id=3 http://www.cacert.org/index.php?id=3