You could setup an iptables rule on the OUTPUT chain to log attempted accesses, then watch the log file, like outlined here: http://stackoverflow.com/questions/11584824/run-a-system-command-when-an-iptables-rule-is-matched You could use "lsof -n ..." to find the command trying to open the port. Another option might be to setup tcpdump to capture all packets (including payload data) going to that server/port, then review that and see if you find any clues about the program making the requests. ❧ Brian Mathis @orev On Fri, May 30, 2014 at 11:14 AM, Eric Falbe <ericf706 at gmail.com> wrote: > Hi All, > > I was wondering if anyone knew of a way to notify or log when a specific > remote port is openened? I have an old LDAP server that I am looking to > get rid of, but there is still a few queries reaching it. > > The sytem authentication is setup correctly (as is Postfix), so I am > thinking there must be some script or program that is setup to query the > older LDAP server. > > I tried using lsof -i|grep 389, but I am not quick enough to get results > before the socket is closed. Is there any program or script I could write > to detect when this socket gets opened, and what PID and/or program owns it? > > Thanks, > Eric Falbe > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >