09-30-2011
when you say they were unable to log in via ssh, were they unable to connect to the box (as in no login prompt) or were they connecting and not being able to use their username and passwd to log in?
If they could get a login prompt please post the output of /var/log/secure for the 28th (might be in secure 1 or 2 depending on log file rotation). (please blank out any usernames or information relating to your server's setup such as I.P.s)
If they could not get a login prompt check /var/adm/boot.log to see if the ssh service was stopped or started on/around that day. Could it have been a fire wall issue preventing access via ssh to that box?
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LEARN ABOUT REDHAT
faillog
FAILLOG(8) System Manager's Manual FAILLOG(8)
NAME
faillog - examine faillog and set login failure limits
SYNOPSIS
faillog [-u login-name] [-a] [-t days]
[-m max] [-pr]
DESCRIPTION
faillog formats the contents of the failure log, /var/log/faillog, and maintains failure counts and limits. The order of the arguments to
faillog is significant. Each argument is processed immediately in the order given.
The -p flag causes failure entries to be printed in UID order. Entering -u login-name flag will cause the failure record for login-name
only to be printed. Entering -t days will cause only the failures more recent than days to be printed. The -t flag overrides the use of
-u. The -a flag causes all users to be selected. When used with the -p flag, this option selects all users who have ever had a login
failure. It is meaningless with the -r flag.
The -r flag is used to reset the count of login failures. Write access to /var/log/faillog is required for this option. Entering -u
login-name will cause only the failure count for login-name to be reset.
The -m flag is used to set the maximum number of login failures before the account is disabled. Write access to /var/log/faillog is
required for this option. Entering -m max will cause all accounts to be disabled after max failed logins occur. This may be modified with
-u login-name to limit this function to login-name only. Selecting a max value of 0 has the effect of not placing a limit on the number of
failed logins. The maximum failure count should always be 0 for root to prevent a denial of services attack against the system.
Options may be combined in virtually any fashion. Each -p, -r, and -m option will cause immediate execution using any -u or -t modifier.
CAVEATS
faillog only prints out users with no successful login since the last failure. To print out a user who has had a successful login since
their last failure, you must explicitly request the user with the -u flag, or print out all users with the -a flag.
Some systems may replace /var/log with /var/adm or /usr/adm.
FILES
/var/log/faillog - failure logging file
SEE ALSO
login(1), faillog(5)
AUTHOR
Julianne Frances Haugh (jockgrrl@ix.netcom.com)
FAILLOG(8)