Interestingly enough, RedHat polls back on this port as part of the IDENT of
sending a message to this list!
> Port 113 is used by remote machines to find out who is trying to connect
> to their machine. One of the biggest uses is by IRC servers to limit
> users to one connection at a time, but other services may use it as
> well. Blocking this port is usualy ok, as long as you are rejecting
> connections, an not denying them. If you use deny, then the system on the
> other end may wait untill it times out before processing your connection.
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