07-17-2006
issues involving sshd, display and apache.
I have a rather peculiar problem in the past 2 weeks. I have a network setup with a linux box acting as a gateway (It is exposed to the internet). Also, there are 2 additional machines that are connected to the gateway (and are not exposed to the outside world). (The gateway has a NAT setup to route traffic to/from the internal machines).
I am also hosting 2 websites on the external gateway so that it can be accessed from the outside world. I work on either of the 2 internal machines and sometimes ssh to the external gateway (from my internal machine) for any maintenance work. Recently, there were times when
1) I was NOT able to ssh to the gateway.
2) I was NOT able to access any of the websites hosted on the gateway (apache is the webserver used).
3) I AM able to access the internet as usual (i.e., the network traffic is routed properly and as usual).
There is an additional problem. i.e, when i connect my monitor, keyboard and mouse to the gateway machine, the display does not come up. :-(.
So all I am left to do is to REBOOT the system (which I heard is not a common practice in the LINUX/UNIX world). As a matter of fact, everything is OK after a REBOOT. I mean the display is there, I am able to access the internet from the internal machines, SSH to the gateway works fine and webservers are accessible.
I looked into all the log files for any suspicious activity, but could not find one. I am still worried that it could be a security issue that someone could just hack into the system and TURN off the ssh daemon and things like that.
Please let me know if you have any ideas on whatz going on??
Thank you very much.
-Ceeeyem.
Last edited by reborg; 07-17-2006 at 07:48 PM..
Reason: resotore original post
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LEARN ABOUT DEBIAN
linux-version
LINUX-VERSION(1) General Commands Manual LINUX-VERSION(1)
NAME
linux-version - operate on Linux kernel version strings
SYNOPSIS
linux-version compare VERSION1 OP VERSION2
linux-version sort [--reverse] [VERSION1 VERSION2 ...]
linux-version list [--paths]
DESCRIPTION
linux-version operates on Linux kernel version strings as reported by uname -r and used in file and directory names. These version strings
do not follow the same rules as Debian package version strings and should not be compared as such or as arbitrary strings.
compare VERSION1 OP VERSION2
Compare version strings, where OP is a binary operator. linux-version returns success (zero result) if the specified condition is
satisfied, and failure (nonzero result) otherwise. The valid operators are: lt le eq ne ge gt
sort [--reverse] [VERSION1 VERSION2 ...]
Sort the given version strings and print them in order from lowest to highest. If the --reverse option is used, print them in order
from highest to lowest.
If no version strings are given as arguments, the version strings will instead be read from standard input, one per line. They may
be suffixed by arbitrary text after a space, which will be included in the output. This means that, for example:
linux-version list --paths | linux-version sort --reverse
will list the installed versions and corresponding paths in order from highest to lowest version.
list [--paths]
List kernel versions installed in the customary location. If the --paths option, show the corresponding path for each version.
AUTHOR
linux-version and this manual page were written by Ben Hutchings as part of the Debian linux-base package.
30 March 2011 LINUX-VERSION(1)