Take the tour ×  I've been using port 2525 as an alternative
mail port for quite some time now with few problems, however,
it's always thrown a nagios alert from time to time that the
service is unavailable, by the time I log in or even try to
telnet to the port there are no issues, nothing in the logs and
no other indications of any other problem. Once in a while I
will try to send mail via that port and I will get a server
unavailable, retry and it's fine.  I'm just wondering if
something else could be blocking./trying that port? or if it has
a limit set somewhere else - other than xinetd.    • xinet
limits are 100 connections, which should be tons and tons for
the number of users actually using it [maybe a dozen]   • I
limited proftpd to use unpriviledged ports higher than that just
in case ftp users were monopolizing the port... does not appear
to be the case.   • scanned for trojans etc, nadda  kinda
stumped on this one as from time to time I will get a mail user
complain and describe the same symptons I