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# SOCKET TYPE
# This option determines what type of socket the daemon will create
# an accept connections from.
# Value:
# unix = Unix domain socket (default)
# tcp = TCP socket
#socket_type=unix
socket_type=tcp
# SOCKET NAME
# This option determines the name and path of the UNIX domain
# socket that the daemon will create and accept connections from.
# This option is only valid if the socket type specified above
# is "unix".
#socket_name=/usr/local/nagios/var/ndo.sock
# TCP PORT
# This option determines what port the daemon will listen for
# connections on. This option is only vlaid if the socket type
# specified above is "tcp".
tcp_port=5668
You've got both the Unix socket and the tcp socket defined as active. Fix the cfg, then restart it