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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
Old 12-20-2017
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...
 

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mountd(1M)																mountd(1M)

NAME
mountd, rpc.mountd - server for NFS mount requests and NFS access checks SYNOPSIS
n] DESCRIPTION
is an RPC server that answers requests for NFS access information and file system mount requests. It reads the file to determine which file systems are available for mounting by which remote machines. See sharetab(4). running on the local server will contact the first time an NFS client tries to access the file system to determine whether the client should get read-write, read-only, or no access. This access can be dependent on the security mode used in the remote procedure call from the client. See share_nfs(1M). The command also provides information as to what file systems are mounted by which clients. This information can be printed using the showmount(1M) command. The daemon is automatically invoked if and in Only superuser can run the daemon. Options The following options are supported: This is an obsolete option. All messages and errors are logged to Reject mount requests from clients. Clients that have file systems mounted will not be affected. Specify tracing level n, where n can have one of the following values: Errors only (default). Errors, requests handled by mountd, results, and the names of the main functions leading to the result Run the command in verbose mode. Each time determines what access a client should get, it will log the result to the as well as the names of the main functions leading to the result. WARNINGS
If is running, must also be running in order to be assured that the NFS server can respond to requests. Some routines that compare hostnames use case-sensitive string comparisons; some do not. If an incoming request fails, verify that the case of the hostname in the file to be parsed matches the case of the hostname called for, and attempt the request again. If a client crashes, executing on the server will show that the client still has a file system mounted. In other words, stale entries may accumulate in for clients that crash without sending an unmount request. Also, if a client mounts the same remote directory twice, only one entry appears in Doing a of one of these directories removes the single entry and no longer indicates that the remote directory is mounted. AUTHOR
was developed by Sun Microsystems, Inc. FILES
shared file system table list of all hosts having file systems mounted from this machine rpc.mountd log file for messages and errors SEE ALSO
nfsd(1M), share(1M), share_nfs(1M), showmount(1M), sharetab(4). mountd(1M)
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