After 1week work, ZM on Ubuntu goes down

[gug]

After 1week work, ZM on Ubuntu goes down.

ssh didnt work (port is open, but cannot login - no promt to login):

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[localhost ~]# ssh user@192.168.0.21
Connection closed by 192.168.0.21

port is works:

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[localhost ~]# telnet 192.168.0.21 22
Trying 192.168.0.21...
Connected to 192.168.0.21 (192.168.0.21).
Escape character is '^]'.
SSH-2.0-OpenSSH_5.3p1 Debian-3ubuntu7

hxxp://192.168.0.21/ works - got standart apache's page

hxxp://192.168.0.21/zm/ - got 500 internal server error


if reboot machine, its still ok - in logs no info about troubles.

what is that?

[gug]

logs omg:

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09/24/11 14:30:19.047219 zmwatch[1754].INF [Watchdog starting]
09/24/11 14:30:19.057489 zmwatch[1754].INF [Watchdog pausing for 30 seconds]
09/30/11 04:35:04.824356 zmwatch[1754].ERR [Can't open memory map file '/dev/shm/zm.mmap.1': Too many open files in system]
09/30/11 04:50:05.495396 zmwatch[1754].ERR [Can't open memory map file '/dev/shm/zm.mmap.1': Too many open files in system]
09/30/11 04:50:15.496471 zmwatch[1754].ERR [Can't open memory map file '/dev/shm/zm.mmap.1': Too many open files in system]
09/30/11 04:50:25.497522 zmwatch[1754].ERR [Can't open memory map file '/dev/shm/zm.mmap.1': Too many open files in system]

in /etc/sysctl.conf fs.file-max = 100000 will be enough?