We are having some FTP reliability problems transfering files from  
inside our NAT network to a public FTP servers outside our network.  
It works fine sometimes, but then we will hit periods were it becomes  
unstable and times-out mid-transfer, http is fine while this is  
happening.

I have tried both passive and non-passive settings and they both seem  
to behave similarly. M0n0wall running on a 4501 our local network is  
running behind NAT with pretty close to a default configuration.

I found comments on running an passive FTP server inside NAT,
http://m0n0.ch/wall/list/showmsg.php?id=6/30
but I it seem unrelated. Any suggestions?

Thanks,
-marc