k360 locks out users

[Jeff Gosnell]

Hello,
I have a K360 That locks out logging in/or
windows already open during nite.Nfs mounts
are OK.Set up NFS mount from another server
to root on k360 yesterday and when server locked up again CD d to root mount. /usr was
there but contained no directories ( including sbin). other directories/mount points (etc,tmp) where there and could be looked at normally. Any clues where to look
to fix this problem would be useful!!
thanks Jeff

[CHRIS_ANORUO]

Check the crontab and /etc/inetd.conf files for telnet time outs

[Stefan Farrelly · Accepted solution]

Hmm. users being locked out at night. Is there some job which runs on this system overnight, like a backup, which could overflow a kernel parameter and thus cause users to be locked out ?
Have you checked /var/adm/syslog/syslog.log for any error messages, particularly kernel ones overnight ?
What does the load average get up to overnight (uptime) ? do you have some stats running (measureware or sar) to see if the box is running very very busy overnight at some point which could also freeze out the users ?
Ive had this problem before. First night I thought I fixed it, but overnight it recurred. Second time I again thought I found it, but it happened again. Third night I stayed at work all night running gpm/top keeping an eye on it and sure enough during the backup the system would go mad and the load average skyrocket causing problems, eventually tracked down to an omniback patch missing. Sometimes the only way to track these sort of problems is an allnighter watching the server constantly.

[John Palmer]

Jeff,

Does the system cure itself or do you have to reboot it?

Anything significant about the time when it locks out?

As it appears to be a network issue, I'm not sure that NFS mounts are actually ok.

Regards,
John

[Tracey]

I've had "lockouts" on one of my machines overnight also, it turned out that one of our nightly processes was ftp'ing to machine 1, but the directory they were writing to was actually NFS'd from machine 2. When the ftp would take place, people would either lock up for the duration of the FTP or would be kicked off all together. We switched our ftp script to go directly to machine 2 and everything has been OK since.

[Jeff Gosnell]

The K360 must be rebooted to regain console
access.I have examined syslog,etc,, and there
is nothing that stands out. Today I have commented out all cron jobs that I am unsure
about and have "rigourously " cleaned up
some of the system access files,IE passwd.
I may have to camp out with this server.
Thanks to all