12-19-2017
Hi,
Thanks all for the tons of replies and suggestions.
Quote:
Possibly the system has run out of network buffer resources. Has the load/number of users been steadily increasing?
Network configurations determine the number of buffers available for network packets (of various different sizes) arriving and departing, and also the maximum number of connections.
Could be possible that the load/number of users steadily increased.
Network configurations in this sense means? Which file?
Maximum connections you mean maximum ssh connections allowed? I believe it is still at the system default which is 60.
A week or 2 earlier, there were few occurrences of where users were not able to login into the server due to too many ssh connections from one user which had root (0) privilege.
Quote:
You need to tell us all what hardware this is, what O/S you are running and which version. Give us a clue!!
Machine model : HP RX7640 ia64
OS version : HPUX B11.23
CPU : 4 Physical, 8 Core
Memory : 128 G
I am not aware of any security scanning devices used in the server.
There was nothing in particular happening in the server at the time of the crash.
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LEARN ABOUT OPENSOLARIS
sys-unconfig
sys-unconfig(1M) System Administration Commands sys-unconfig(1M)
NAME
sys-unconfig - undo a system's configuration
SYNOPSIS
/usr/sbin/sys-unconfig
DESCRIPTION
The sys-unconfig command is used to restore a system's configuration to an "as-manufactured" state, ready to be reconfigured again. The
system's configuration consists of hostname, Network Information Service (NIS) domain name, timezone, IP address, IP subnet mask, and root
password. This operation is the inverse of those performed by the sysidnet(1M), sysidns(1M), and sysidsys(1M) programs run at boot. See
sysidtool(1M).
sys-unconfig does the following:
o Saves current /etc/inet/hosts file information in /etc/inet/hosts.saved.
o If the current /etc/vfstab file contains NFS mount entries, saves the /etc/vfstab file to /etc/vfstab.orig.
o Restores the default /etc/inet/hosts file.
o Removes the default hostname in /etc/hostname.interface files for all interfaces configured when this command is run. To deter-
mine which interfaces are configured, run the command 'ifconfig-a'. The /etc/hostname.interface files corresponding to all of
the interfaces listed in the resulting output, with the exception of the loopback interface (lo0), will be removed.
o Removes the default domainname in /etc/defaultdomain.
o Restores the timezone to PST8PDT in /etc/TIMEZONE.
o Disables the Network Information Service (NIS) and Network Information Service Plus (NIS+) if either NIS or NIS+ was configured.
o Removes the file /etc/inet/netmasks.
o Removes the file /etc/defaultrouter.
o Removes the password set for root in /etc/shadow.
o Removes the file /etc/.rootkey.
o Executes all system configuration applications. These applications are defined by prior executions of a sysidconfig -a applica-
tion. (See sysidconfig(1M)). When sys-unconfig is run, all system configuration applications are passed one argument, -u.
o Removes the file /etc/resolv.conf.
o Removes the file /etc/sysidcfg.
o Disables LDAP by removing /var/ldap/ldap_client_cache, /var/ldap/ldap_client_file, /var/ldap/ldap_client_cred, and
/var/ldap/cachemgr.log.
o Regenerates keys for sshd(1M).
When sys-unconfig is finished, it performs a system shutdown. sys-unconfig is a potentially dangerous utility and can only be run by the
super user.
FILES
/etc/default/init
process control initialization
/etc/defaultdomain
determines host's domain name
/etc/defaultrouter
specifies an IPv4 host's default router
/etc/hostname.interface
identifies symbolic host name associated with network interface interface
/etc/inet/hosts
host name database
/etc/inet/netmasks
network mask database
/etc/nodename
local source for system name
/etc/.rootkey
super-user's secret key
/etc/shadow
shadow password file
/etc/sysidcfg
system identification configuration file for diskless booting
/etc/vfstab
virtual file system table
/var/nis/NIS_COLD_START
list of NIS+ servers that serve a host's default domain
/var/yp/binding/*/ypservers
identifies NIS servers to which the client is allowed to bind
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWadmap |
+-----------------------------+-----------------------------+
SEE ALSO
init(1M), kdmconfig(1M), sshd(1M), sysidconfig(1M), sysidtool(1M), hosts(4), netmasks(4), shadow(4), sysidcfg(4), attributes(5)
NOTES
sys-unconfig is not available on diskless clients.
SunOS 5.11 19 Jul 2007 sys-unconfig(1M)