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User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0) Opera 
7.50  [en]

Description of problem:
System stop working, but seems to working: on console can enter 
username, but there is no password prompt; on network listen on all 
port but not give back any banner, and reset connection ater ~5 
minutes; there is no entry in any log file after. The problem occours 
on 4 machine running this kernel. Logs show no problem, no entry in 
audit, process accountig and syslog relevant to hang up.

Version-Release number of selected component (if applicable):
kernel-2.4.21-20.EL

How reproducible:
Didn't try

Steps to Reproduce:
1. I don't know why it happens. Occoured 1-4 times in a month.
2.
3.
    

Additional info:

There is 4 machine:
1. MAIL: ide disk, using home partition mounted over nfs.
2. FILE: 3ware 9000 sata controller (8 disk, raid10 array), use an 
firewire accessed ide disk for backups, home partition exported over 
nfs.
3. WWW: ide disk, not use nfs.

All machine using processor pentium 4.

4. Workstation: i don't know any hardware parameters, I'm not 
managing it.