Failed TCP accept: enfile

I'm getting these messages in my ejabberd.log:

E(<0.31284.4082>:ejabberd_listener:293) : (#Port<0.96890897>) Failed TCP accept: enfile

I think this is some resource being exhausted, however I've increased ERL_MAX_PORTS to 200k and increased various linux file # limits to large amounts include # open files, ip_conntrack_max, etc.

I've noticed that length(erlang:ports()) is near but never over 32768 when this happens.

I'm using R14B04 and ejabberd 2.1.11

Thanks!