How to diagnose "Limiting closed port RST response from 213 to 205 packets/sec" ?

So I am running some servers with 14.1-STABLE, pretty standard - Apache 
+ mysql setup, and I am seeing a lot of the above messages. I have 
always seen these form time to time, but recently I have had compmnaits 
from a customer about the webservers being unavailable, and the times 
they give correspond to bursts of these errors.

I dont see any other errors, and am wondering how to get more info about 
this message. Knowing if its IPv4 or IPv6 would be nice. Knowing the 
port that is closed would be ideal. I have a feeling that the closed 
port is the one which Apaxche is suppsoed to be listenin gon (I cant 
think of nay other ports which would get hammered), but that should 
never be closed.

Any advice ?

-pete.