When I use option logclosing I get messages about closing tcp connections
started from my side.

Mirek
--- Begin /etc/ippl.conf (modified conffile)
ident
nologclosing
expire 3600
log-in all /var/log/ippl/all.log
log-in udp /var/log/ippl/udp.log
run icmp tcp
run udp
logformat detailed all
ignore icmp type echo_reply
log options ident,resolve tcp port telnet
ignore udp from localhost
ignore udp port domain
ignore udp srcport domain
ignore udp port ntp
ignore udp port route
log options logclosing,ident,resolve tcp to mirek
ignore tcp from mirek
log options nologclosing tcp port auth to mirek
ignore tcp port auth from mirek
--- End /etc/ippl.conf

It is a bug. I had a look at it and it is not easy to fix it without
Linux-specific code. See the BUGS file in 1.4.7.