In the description in the conf file, it informs TCP_IN and induces to think that it will be only for IN(put)
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# This option uses the same format as TCP_IN/UDP_IN. The ports listed should
# NOT be removed from TCP_IN/UDP_IN
#
# An example would be to list port 21 here then countries listed in
# CC_DENY_PORTS cannot access FTP
CC_DENY_PORTS_TCP = ""
CC_DENY_PORTS_UDP = ""