Sudden application crash in servers Post: 303009785

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Operating Systems HP-UX Sudden application crash in servers Post 303009785 by vbe on Wednesday 20th of December 2017 03:44:40 AM

12-20-2017

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The scanner is not in the server but somewhere on your network, internal I hope, or it may be an attack as mentionned... so in internal it seems there is something looking like a such device at the IP I pointed out - Check!
Years ago I had many HP-UX crashes once a month till I decided to write at the direction saying those "non-intrusive" devices were all but that and crashing HP servers or some mainframe devices, mostly the ones trusted and having/using NFS, the reason is mainly it opens so many connections id doesnt care for itself (MS.. OS?) but on a UNIX server the timeouts are regularly over 5 minutes so a opened port cannot be used till it is cleaned and so in such cases quickly you run out and then no one can connect, not even root and you are doomed... Once I proved where it came from the HP servers were listed out the scanning process... and now they changed system, but I have no more HP either... If you have NFS mounted on that server and the scan manages to make it unreadable then your system depending what is running will try to read desperatly and it s load will go beyond control till the system crashes...

vbe

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LEARN ABOUT SUNOS

dfmounts_nfs

dfmounts_nfs(1M)					  System Administration Commands					  dfmounts_nfs(1M)

NAME

       dfmounts_nfs - display mounted NFS resource information

SYNOPSIS

       dfmounts [ -F nfs] [-h] [server...]

DESCRIPTION

       dfmounts  shows	the local resources shared through  NFS, along with the list of clients that have mounted the resource. The -F flag may be
       omitted if  NFS is the only file system type listed in the file	/etc/dfs/fstypes.

       dfmounts without options, displays all remote resources mounted on the local system, regardless of file system type.

       The output of dfmounts consists of an optional header line (suppressed with the -h flag) followed by a list of lines containing whitespace-
       separated fields.  For each resource, the fields are:

       resource server pathname clients ...

       where

       resource        Does not apply to  NFS.	Printed as a hyphen (-).

       server	       Specifies the system from which the resource was mounted.

       pathname        Specifies the pathname that must be given to the share(1M) command.

       clients	       Is a comma-separated list of systems that have mounted the resource.

OPTIONS

       -F nfs	       Specifies the nfs-FSType.

       -h	       Suppress header line in output.

       server	       Displays  information  about  the resources mounted from each server, where server can be any system on the network.  If no
		       server is specified, the server is assumed to be the local system.

FILES

       /etc/dfs/fstypes

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWnfscu 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mount(1M), share(1M), unshare(1M), attributes(5)

SunOS 5.10							    6 Nov 2000							  dfmounts_nfs(1M)