I have this task in my crontab

0 14 * * * command

but in my /var/log/syslog, I have

Jun 21 19:00:01 debian-squeeze-base /USR/SBIN/CRON[12810]: (user) CMD (command)

why the task run 5 hours later ?

I try connect over ssh with

 ssh -X user@host

but I get

$ xterm
xterm Xt error: Can't open display: xterm:  DISPLAY is not set

$ echo $DISPLAY
# ... nothing

In my sshd_config I have

X11Forwarding yes
X11DisplayOffset 10

EDIT

In /var/log/auth.log I get

 sshd[7396]: error: Failed to allocate internet-domain X11 display socket.

when I installed joomla I can't see the index.php and I get this messages in my /var/log/apache2/error.log

[notice] child pid 3211 exit signal Segmentation fault (11)

for activate the coredump, I follow the instructions in this link

CoreDumpDirectory /tmp/apache2-gdb-dump # added this to /etc/apache2/apache2.conf
mkdir -p /tmp/apache2-gdb-dump
chown www-data: /tmp/apache2-gdb-dump
chmod 0777 /tmp/apache2-gdb-dump
/etc/init.d/httpd restart

but I don't see nothing in coredumpdirectory

ls /tmp/apache2-gdb-dump

I can see the localhost/administrator of joomla but not localhost/index.php.

How I can verify the configuration of sshd?

For example, I want to make sure that these settings are set and applied:

AllowUsers user1 user2 
PasswordAuthentication no
PermitRootLogin no

Is the only way manually verifying the contents of the file sshd_config, or can I probe sshd to make sure?

when I make

nmap localhost

I get

PORT    STATE SERVICE
22/tcp  open  ssh
25/tcp  open  smtp
111/tcp open  rpcbind
631/tcp open  ipp
646/tcp open  unknown

what is the port 646 ?

If I have many public ssh keys.

Is a good idea show all of my public keys in web page?
maybe a gist or similar .

EDIT

my problem is : when I create a new server, I have to manually copy the keys.

I have a NAS mount, and I can copy file to this,
but I can't copy files similar to this

cp /home2/user/WRF/WRFV3/run/*_2 . -v
`/home2/user/WRF/WRFV3/run/wrfout_d04_2007-11-21_00:00:00_2' -> `./wrfout_d04_2007-11-21_00:00:00_2'
cp: cannot create regular file `./wrfout_d04_2007-11-21_00:00:00_2': Not a directory

I get this error.

EDIT

when I try make a file with : in the name, I get a error

$ date >> file\:file
-bash: file:file: Not a directory

but this command work in my home

in ssh with

 ssh -CX user@remoteA

I can launch a xterm and see in my local desktop.

if I have a linux server (remoteA) without X server and a remote linux desktop (remoteB) with a X server.
If I connect with ssh to remoteB over remoteA

local -ssh-> remoteA -ssh-> remoteB

how I can launch a xterm in remoteB and see in local ?

How I can set a anonymous sftp user ?

I generate the ssh keys pair, set /usr/lib/sftp-server as shell in /etc/password and share the private key (id_rsa) and with this command the users get access

 sftp -oIdentityFile=id_rsa public_sftp@host

is a good idea ?

In apache,
How I can redirected the pages not found to / ?

Not Found

The requested URL /dsadsa was not found on this server.

In linux, If I added a file or a directory in /etc/skel, when I create a user this get the file or dir in skel.

with

ssh-keygen -t rsa 

I can create the ssh keys

how I can automatically create the ssh keys each time when I added a user?

I have two network interfaces with respective ips

 eth0 : 192.168.70.153
 eth2 : 192.168.70.155

when I make

 route -C
 Kernel IP routing cache
 Source          Destination     Gateway         Flags Metric Ref    Use Iface
 192.168.70.155 192.168.70.152  192.168.70.152        0      0        0 eth0

how I can force a telnet conection to 192.168.70.152 over eth2?

I connect to a server over ssh with

ssh -CX server

ok, And I launch remote graphical apps, ok. But after some minutes I get

Gtk-WARNING **: cannot open display

And I have to reset the ssh connection.

Added some outputs

$ echo $DISPLAY; echo $XAUTHORITY
localhost:11.0

$ xauth list
machine/unix:12
machine/unix:10
machine/unix:11

When I try this on Debian Squeeze

date |mail -s "mail test " myUser

with mail command get

No mail for myUser 

I would currently monitoring data transfer on my server(debian).
what software do you recommend?

In Ubuntu server (with ssh protocol), how I can change the time of disconnection for inactivity?

in a SGE script with

#$ -M [email protected] 
#$ -m aes

SGE send notify of job complete.
how I can receive the output of the job with the this notification ?