Ping of death has happened before. You do not serve any purpose by opening ports that you do not intend to use. Closing all unneeded port is called minimizing attack surface.<p>Ports may not be inherently secure or insecure, but the history of their usage give them bias towards likely being secure or insecure. Chrome does the right thing by blocking these ports as an overwhelmingly large percentage of their users will probably hit this port under &quot;insecure&quot; situations.  Those who need to use these ports can and will find alternate ways to do it.