On 2013-02-10, Stefan Sieg <[email protected]> wrote: > on my poolserver i saw this message 50+ per hour. > Today i found that they were caused by clients connecting with > source port 0. I don't think that this are valid connections, > after blocking them with pf the ntpd warnings are gone.
IIRC old versions of firewall/1 will protect you from this by crashing :-) They are probably from crappy IP stacks on embedded systems (routers etc). Port 0 is reserved and shouldn't be used.
