SCO Unix, Xenix and ODT General FAQ

This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.

Why do I see "ttloop: peer died" in SCO Unix syslog?

If you are seeing a lot of these, it may be because someone is scanning your machine looking for open ports. This is an example:

  Jan 24 16:54:30 scobox telnetd[2843]: ttloop:  peer died: Unknown error
  Jan 24 16:59:31 scobox telnetd[2844]: ttloop:  peer died: Unknown error
  Jan 24 17:04:36 scobox telnetd[2845]: ttloop:  peer died: Unknown error
  Jan 24 17:09:31 scobox telnetd[2851]: ttloop:  peer died: Unknown error
  Jan 24 17:14:31 scobox telnetd[2860]: ttloop:  peer died: Unknown error
  Jan 24 17:19:32 scobox telnetd[2861]: ttloop:  peer died: Unknown error
  Jan 24 17:24:32 scobox telnetd[2899]: ttloop:  peer died: Unknown error
  Jan 24 17:29:31 scobox telnetd[2902]: ttloop:  peer died: Unknown error
  Jan 24 17:34:32 scobox telnetd[2912]: ttloop:  peer died: Unknown error
  Jan 24 17:39:32 scobox telnetd[2927]: ttloop:  peer died: Unknown error
 

It could also just be a bad line.. look for failing telnets:

#!/bin/sh
  while :; do
    netstat -n -p tcp | fgrep '.23 '  | sed "/ESTABLISHED/d"
    sleep 5
  done
 

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