Run following command:
(1)netstat -tulpn | less or
(2)netstat -lntp | grep :21 (put any port)
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 23054/vsftpd
(3)netstat -lnp | grep '0.0.0.0:80'
(4)netstat -lnp | grep 'exim'
tcp 0 0 0.0.0.0:465 0.0.0.0:* LISTEN 22105/exim
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 22097/exim
tcp 0 0 0.0.0.0:26 0.0.0.0:* LISTEN 22091/exim
Showing posts with label Security and Firewall. Show all posts
Showing posts with label Security and Firewall. Show all posts
Monday, April 13, 2009
Monday, March 23, 2009
APF
What is APF (Advanced Policy Firewall)? APF Firewall
APF is a policy based iptables firewall system designed for ease of use and configuration. It employs a subset of features to satisfy the veteran Linux user and the novice alike. Packaged in tar.gz format and RPM formats, make APF ideal for deployment in many server environments based on Linux. APF is developed and maintained by R-fx Networks: R-fx Networks - Internet Security Solutions - Projects » APF
This guide will show you how to install and configure APF firewall, one of the better known Linux firewalls available.10
Requirements:
- Root SSH access to your server
Lets begin!
Login to your server through SSH and su to the root user.
1. cd /root/downloads or another temporary folder where you store your files.
2. wget http://www.rfxnetworks.com/downloads/apf-current.tar.gz
3. tar -xvzf apf-current.tar.gz
4. cd apf-0.9.5-1/ or whatever the latest version is.
5. Run the install file: ./install.sh
You will receive a message saying it has been installed
Installing APF 0.9.5-1: Completed.
Installation Details:
Install path: /etc/apf/
Config path: /etc/apf/conf.apf
Executable path: /usr/local/sbin/apf
AntiDos install path: /etc/apf/ad/
AntiDos config path: /etc/apf/ad/conf.antidos
DShield Client Parser: /etc/apf/extras/dshield/
Other Details:
Listening TCP ports: 1,21,22,25,53,80,110,111,143,443,465,993,995,2082, 2083,2086,2087,2095,2096,3306
Listening UDP ports: 53,55880
Note: These ports are not auto-configured; they are simply presented for information purposes. You must manually configure all port options.
6. Lets configure the firewall: pico /etc/apf/conf.apf
We will go over the general configuration to get your firewall running. This isn't a complete detailed guide of every feature the firewall has. Look through the README and the configuration for an explanation of each feature.We like to use DShield.org's "block" list of top networks that have exhibited
suspicious activity.
FIND: USE_DS="0"
CHANGE TO: USE_DS="1"
7. Configuring Firewall Ports:
Cpanel Servers
We like to use the following on our Cpanel Servers
Common ingress (inbound) ports
# Common ingress (inbound) TCP ports -3000_3500 = passive port range for Pure FTPD
IG_TCP_CPORTS="21,22,25,53,80,110,143,443,2082,208 3, 2086,2087, 2095, 2096,3000_3500"
#
# Common ingress (inbound) UDP ports
IG_UDP_CPORTS="53"
Common egress (outbound) ports
# Egress filtering [0 = Disabled / 1 = Enabled]
EGF="1"
# Common egress (outbound) TCP ports
EG_TCP_CPORTS="21,25,80,443,43,2089"
#
# Common egress (outbound) UDP ports
EG_UDP_CPORTS="20,21,53"
Ensim Servers
We have found the following can be used on Ensim Servers - although we have not tried these ourselves as I don't run Ensim boxes.
Common ingress (inbound) ports
# Common ingress (inbound) TCP ports
IG_TCP_CPORTS="21,22,25,53,80,110,143,443,19638"
#
# Common ingress (inbound) UDP ports
IG_UDP_CPORTS="53"
Common egress (outbound) ports
# Egress filtering [0 = Disabled / 1 = Enabled]
EGF="1"
# Common egress (outbound) TCP ports
EG_TCP_CPORTS="21,25,80,443,43"
#
# Common egress (outbound) UDP ports
EG_UDP_CPORTS="20,21,53"
Save the changes: Ctrl+X then Y
8. Starting the firewall
/usr/local/sbin/apf -s
Other commands:
usage ./apf [OPTION]
-s|--start ......................... load firewall policies
-r|--restart ....................... flush & load firewall
-f|--flush|--stop .................. flush firewall
-l|--list .......................... list chain rules
-st|--status ....................... firewall status
-a HOST CMT|--allow HOST COMMENT ... add host (IP/FQDN) to allow_hosts.rules and
immediately load new rule into firewall
-d HOST CMT|--deny HOST COMMENT .... add host (IP/FQDN) to deny_hosts.rules and
immediately load new rule into firewall
9. After everything is fine, change the DEV option
Stop the firewall from automatically clearing itself every 5 minutes from cron.
We recommend changing this back to "0" after you've had a chance to ensure everything is working well and tested the server out.
pico /etc/apf/conf.apf
FIND: DEVM="1"
CHANGE TO: DEVM="0"
10. Configure AntiDOS for APF
Relatively new to APF is the new AntiDOS feature which can be found in: /etc/apf/ad
The log file will be located at /var/log/apfados_log so you might want to make note of it and watch it!
pico /etc/apf/ad/conf.antidos
There are various things you might want to fiddle with but I'll get the ones that will alert you by email.
# [E-Mail Alerts]
Under this heading we have the following:
# Organization name to display on outgoing alert emails
CONAME="Your Company"
Enter your company information name or server name..
# Send out user defined attack alerts [0=off,1=on]
USR_ALERT="0"
Change this to 1 to get email alerts
# User for alerts to be mailed to
USR="your@email.com"
Enter your email address to receive the alerts
Save your changes! Ctrl+X then press Y
Restart the firewall: /usr/local/sbin/apf -r
11. Checking the APF Log
Will show any changes to allow and deny hosts among other things.
tail -f /var/log/apf_log
Example output:
Aug 23 01:25:55 ocean apf(31448): (insert) deny all to/from 185.14.157.123
Aug 23 01:39:43 ocean apf(32172): (insert) allow all to/from 185.14.157.123
12. New - Make APF Start automatically at boot time
To autostart apf on reboot, run this:
chkconfig --level 2345 apf on
To remove it from autostart, run this:
chkconfig --del apf
13. Denying IPs with APF Firewall (Blocking)
Now that you have your shiny new firewall you probably want to block a host right, of course you do! With this new version APF now supports comments as well. There are a few ways you can block an IP, I'll show you 2 of the easier methods.
A) /etc/apf/apf -d IPHERE COMMENTHERENOSPACES
> The -d flag means DENY the IP address
> IPHERE is the IP address you wish to block
> COMMENTSHERENOSPACES is obvious, add comments to why the IP is being blocked
These rules are loaded right away into the firewall, so they're instantly active.
Example:
./apf -d 185.14.157.123 TESTING
pico /etc/apf/deny_hosts.rules
Shows the following:
# added 185.14.157.123 on 08/23/05 01:25:55
# TESTING
185.14.157.123
B) pico /etc/apf/deny_hosts.rules
You can then just add a new line and enter the IP you wish to block. Before this becomes active though you'll need to reload the APF ruleset.
/etc/apf/apf -r
14. Allowing IPs with APF Firewall (Unblocking)
I know I know, you added an IP now you need it removed right away! You need to manually remove IPs that are blocked from deny_hosts.rules.
A)
pico /etc/apf/deny_hosts.rules
Find where the IP is listed and remove the line that has the IP.
After this is done save the file and reload apf to make the new changes active.
/etc/apf/apf -r
B) If the IP isn't already listed in deny_hosts.rules and you wish to allow it, this method adds the entry to allow_hosts.rules
/etc/apf/apf -a IPHERE COMMENTHERENOSPACES
> The -a flag means ALLOW the IP address
> IPHERE is the IP address you wish to allow
> COMMENTSHERENOSPACES is obvious, add comments to why the IP is being removed These rules are loaded right away into the firewall, so they're instantly active.
Example:
./apf -a 185.14.157.123 UNBLOCKING
pico /etc/apf/allow_hosts.rules
# added 185.14.157.123 on 08/23/05 01:39:43
# UNBLOCKING
185.14.157.123
=============================
APF is a policy based iptables firewall system designed for ease of use and configuration. It employs a subset of features to satisfy the veteran Linux user and the novice alike. Packaged in tar.gz format and RPM formats, make APF ideal for deployment in many server environments based on Linux. APF is developed and maintained by R-fx Networks: R-fx Networks - Internet Security Solutions - Projects » APF
This guide will show you how to install and configure APF firewall, one of the better known Linux firewalls available.10
Requirements:
- Root SSH access to your server
Lets begin!
Login to your server through SSH and su to the root user.
1. cd /root/downloads or another temporary folder where you store your files.
2. wget http://www.rfxnetworks.com/downloads/apf-current.tar.gz
3. tar -xvzf apf-current.tar.gz
4. cd apf-0.9.5-1/ or whatever the latest version is.
5. Run the install file: ./install.sh
You will receive a message saying it has been installed
Installing APF 0.9.5-1: Completed.
Installation Details:
Install path: /etc/apf/
Config path: /etc/apf/conf.apf
Executable path: /usr/local/sbin/apf
AntiDos install path: /etc/apf/ad/
AntiDos config path: /etc/apf/ad/conf.antidos
DShield Client Parser: /etc/apf/extras/dshield/
Other Details:
Listening TCP ports: 1,21,22,25,53,80,110,111,143,443,465,993,995,2082, 2083,2086,2087,2095,2096,3306
Listening UDP ports: 53,55880
Note: These ports are not auto-configured; they are simply presented for information purposes. You must manually configure all port options.
6. Lets configure the firewall: pico /etc/apf/conf.apf
We will go over the general configuration to get your firewall running. This isn't a complete detailed guide of every feature the firewall has. Look through the README and the configuration for an explanation of each feature.We like to use DShield.org's "block" list of top networks that have exhibited
suspicious activity.
FIND: USE_DS="0"
CHANGE TO: USE_DS="1"
7. Configuring Firewall Ports:
Cpanel Servers
We like to use the following on our Cpanel Servers
Common ingress (inbound) ports
# Common ingress (inbound) TCP ports -3000_3500 = passive port range for Pure FTPD
IG_TCP_CPORTS="21,22,25,53,80,110,143,443,2082,208 3, 2086,2087, 2095, 2096,3000_3500"
#
# Common ingress (inbound) UDP ports
IG_UDP_CPORTS="53"
Common egress (outbound) ports
# Egress filtering [0 = Disabled / 1 = Enabled]
EGF="1"
# Common egress (outbound) TCP ports
EG_TCP_CPORTS="21,25,80,443,43,2089"
#
# Common egress (outbound) UDP ports
EG_UDP_CPORTS="20,21,53"
Ensim Servers
We have found the following can be used on Ensim Servers - although we have not tried these ourselves as I don't run Ensim boxes.
Common ingress (inbound) ports
# Common ingress (inbound) TCP ports
IG_TCP_CPORTS="21,22,25,53,80,110,143,443,19638"
#
# Common ingress (inbound) UDP ports
IG_UDP_CPORTS="53"
Common egress (outbound) ports
# Egress filtering [0 = Disabled / 1 = Enabled]
EGF="1"
# Common egress (outbound) TCP ports
EG_TCP_CPORTS="21,25,80,443,43"
#
# Common egress (outbound) UDP ports
EG_UDP_CPORTS="20,21,53"
Save the changes: Ctrl+X then Y
8. Starting the firewall
/usr/local/sbin/apf -s
Other commands:
usage ./apf [OPTION]
-s|--start ......................... load firewall policies
-r|--restart ....................... flush & load firewall
-f|--flush|--stop .................. flush firewall
-l|--list .......................... list chain rules
-st|--status ....................... firewall status
-a HOST CMT|--allow HOST COMMENT ... add host (IP/FQDN) to allow_hosts.rules and
immediately load new rule into firewall
-d HOST CMT|--deny HOST COMMENT .... add host (IP/FQDN) to deny_hosts.rules and
immediately load new rule into firewall
9. After everything is fine, change the DEV option
Stop the firewall from automatically clearing itself every 5 minutes from cron.
We recommend changing this back to "0" after you've had a chance to ensure everything is working well and tested the server out.
pico /etc/apf/conf.apf
FIND: DEVM="1"
CHANGE TO: DEVM="0"
10. Configure AntiDOS for APF
Relatively new to APF is the new AntiDOS feature which can be found in: /etc/apf/ad
The log file will be located at /var/log/apfados_log so you might want to make note of it and watch it!
pico /etc/apf/ad/conf.antidos
There are various things you might want to fiddle with but I'll get the ones that will alert you by email.
# [E-Mail Alerts]
Under this heading we have the following:
# Organization name to display on outgoing alert emails
CONAME="Your Company"
Enter your company information name or server name..
# Send out user defined attack alerts [0=off,1=on]
USR_ALERT="0"
Change this to 1 to get email alerts
# User for alerts to be mailed to
USR="your@email.com"
Enter your email address to receive the alerts
Save your changes! Ctrl+X then press Y
Restart the firewall: /usr/local/sbin/apf -r
11. Checking the APF Log
Will show any changes to allow and deny hosts among other things.
tail -f /var/log/apf_log
Example output:
Aug 23 01:25:55 ocean apf(31448): (insert) deny all to/from 185.14.157.123
Aug 23 01:39:43 ocean apf(32172): (insert) allow all to/from 185.14.157.123
12. New - Make APF Start automatically at boot time
To autostart apf on reboot, run this:
chkconfig --level 2345 apf on
To remove it from autostart, run this:
chkconfig --del apf
13. Denying IPs with APF Firewall (Blocking)
Now that you have your shiny new firewall you probably want to block a host right, of course you do! With this new version APF now supports comments as well. There are a few ways you can block an IP, I'll show you 2 of the easier methods.
A) /etc/apf/apf -d IPHERE COMMENTHERENOSPACES
> The -d flag means DENY the IP address
> IPHERE is the IP address you wish to block
> COMMENTSHERENOSPACES is obvious, add comments to why the IP is being blocked
These rules are loaded right away into the firewall, so they're instantly active.
Example:
./apf -d 185.14.157.123 TESTING
pico /etc/apf/deny_hosts.rules
Shows the following:
# added 185.14.157.123 on 08/23/05 01:25:55
# TESTING
185.14.157.123
B) pico /etc/apf/deny_hosts.rules
You can then just add a new line and enter the IP you wish to block. Before this becomes active though you'll need to reload the APF ruleset.
/etc/apf/apf -r
14. Allowing IPs with APF Firewall (Unblocking)
I know I know, you added an IP now you need it removed right away! You need to manually remove IPs that are blocked from deny_hosts.rules.
A)
pico /etc/apf/deny_hosts.rules
Find where the IP is listed and remove the line that has the IP.
After this is done save the file and reload apf to make the new changes active.
/etc/apf/apf -r
B) If the IP isn't already listed in deny_hosts.rules and you wish to allow it, this method adds the entry to allow_hosts.rules
/etc/apf/apf -a IPHERE COMMENTHERENOSPACES
> The -a flag means ALLOW the IP address
> IPHERE is the IP address you wish to allow
> COMMENTSHERENOSPACES is obvious, add comments to why the IP is being removed These rules are loaded right away into the firewall, so they're instantly active.
Example:
./apf -a 185.14.157.123 UNBLOCKING
pico /etc/apf/allow_hosts.rules
# added 185.14.157.123 on 08/23/05 01:39:43
# UNBLOCKING
185.14.157.123
=============================
change the ssh port
It is advisable to change your ssh port from defaul 22 to something higher to lower your chances of brute force attacks
Below are the steps to change the ssh port.
1. Update /etc/ssh/sshd_config file, line 13 (it might be different in your file):
old line:
Port 22
Change it to:
Port 18675 # any port number you wish
2. You need to update your /etc/services file to tell that your ssh service will now use a different port. Jump to line number 45 (may be differnt in your file) and change port number:
old line:
ssh 22/tcp # SSH Remote Login Protocol
change it to:
ssh 54545/tcp # SSH Remote Login Protocol
save and exit from the file.
3. Restart your sshd service,
# /etc/init.d/sshd restart
It should go smooth. You have to specify port number every time you use ssh or scp or any other service which use ssh in any way.
If your server or machine is behind a firewall, you must open the newly assigned port in your firewall.
4. Open a port in firewall
#cd /etc/sysconfig
#vi iptables
add the following line(just change port number in place of 1867)
-A RH-Firewall-1-INPUT -m tcp -p tcp --dport 1867 -j ACCEPT
save and restart iptables service.
=====================================================
How to open a port in APF
Open port 2346 using APF
Login as the root
Open config file /etc/apf/conf.apf
# vi /etc/apf/conf.apf
Find line that read as follows:
IG_TCP_CPORTS
Add port 2346 (keep all other ports):
IG_TCP_CPORTS="2346,22,25,53,80,443,993,904,...."
Close and save the file. Restart firewall:
# /etc/init.d/apf restart
Below are the steps to change the ssh port.
1. Update /etc/ssh/sshd_config file, line 13 (it might be different in your file):
old line:
Port 22
Change it to:
Port 18675 # any port number you wish
2. You need to update your /etc/services file to tell that your ssh service will now use a different port. Jump to line number 45 (may be differnt in your file) and change port number:
old line:
ssh 22/tcp # SSH Remote Login Protocol
change it to:
ssh 54545/tcp # SSH Remote Login Protocol
save and exit from the file.
3. Restart your sshd service,
# /etc/init.d/sshd restart
It should go smooth. You have to specify port number every time you use ssh or scp or any other service which use ssh in any way.
If your server or machine is behind a firewall, you must open the newly assigned port in your firewall.
4. Open a port in firewall
#cd /etc/sysconfig
#vi iptables
add the following line(just change port number in place of 1867)
-A RH-Firewall-1-INPUT -m tcp -p tcp --dport 1867 -j ACCEPT
save and restart iptables service.
=====================================================
How to open a port in APF
Open port 2346 using APF
Login as the root
Open config file /etc/apf/conf.apf
# vi /etc/apf/conf.apf
Find line that read as follows:
IG_TCP_CPORTS
Add port 2346 (keep all other ports):
IG_TCP_CPORTS="2346,22,25,53,80,443,993,904,...."
Close and save the file. Restart firewall:
# /etc/init.d/apf restart
Sunday, February 22, 2009
DDOS Attack
First aid for DDOS attack on port 80
We can use the following steps to recover our server from a DDOS attack on the port 80. To do this you must have logged into the server as a root user.
Step 1 : Install/Configure APF firewall
=============================
a) If there are no firewalls installed on the server please install the same,
you will get the steps and directions from the following site.
http://www.webhostgear.com/61.html
b) Turn on the antidos option (USE_AD) in the APF conf file
# vi /etc/apf/conf.apf
USE_AD = 1
Step 2 : Install/Configure mod_evasive (for Apache 1.3x)
=============================
mod_evasive and mod_dosevasive are the same
a) Install mod_evasive
# wget http://www.zdziarski.com/projects/mo..._1.10.1.tar.gz
# tar -xzvf mod_evasive_1.10.1.tar.gz
# cd mod_evasive
# /usr/local/apache/bin/apxs -i -a -c mod_evasive.c
# /etc/init.d/httpd restart
b) Also include the following lines in the apache conf file
# vi /usr/local/apache/conf/httpd.conf
-------------------------------------------------
DOSHashTableSize 3097
DOSPageCount 2
DOSSiteCount 50
DOSPageInterval 1
DOSSiteInterval 1
DOSBlockingPeriod 10
-------------------------------------------------
c) Restart the webserver
# /etc/init.d/httpd restart
Step 3 : Install mod_security
=============================
Normally we can find/install this module from WHM
WHM >> cPanel >> Addon Modules >> Select "modsecurity " >>save
Step 4 : Blocking IPs
a) Find the IPs those have established a connection with the server
(The following command is the better one to get the IPs, as this will sort the IPs
according to the number of connections).
===========================================================================
netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
===========================================================================
b) Block them using IPTABLES
iptables -I INPUT -s 81.134.13.35 -j DROP
service iptables save
service iptables restart
apf -d ip np
c) Block them on APF too
vi /etc/apf/deny_hosts.rules
service apf restart
Step 5 : Optimizing the httpd.conf file
=============================
# vi /usr/local/apache/conf/httpd.conf
Change the bellow options as follows, original values are shown in the
bracket.
MaxKeepAliveRequests 50 (100)
KeepAliveTimeout 60 (30)
Also edit the following options too, according to the situation.
Timeout
KeepAliv
MinSpareServers
MaxSpareServers
MaxClients
=============
Step 6 : Install/Configure 3rd party DDOS prevention tools
=============================
We can also use the most trusting 3rd party script 'DDoS-Deflate' for preventing DDOS attack effectively.
Steps to install this script are as follows.
# wget http://www.inetbase.com/scripts/ddos/install.sh
# sh install.sh
Add the script '/usr/local/ddos/ddos.sh' to cron as follows
# crontab -e
*/5 * * * * /usr/local/ddos/ddos.sh >/dev/null 2>&1
Step 7 : Suspend websites
=============================
Check the bandwidth usage of all the domains and suspend the high bandwidth consuming domains for a while
PERMANENT WAY TO FIX THE DDOS ATTACK
=============================
As we all know the softwares have its own limitations for preventing against DDOS attack, we can follow these steps to cure it permanently.
1. Ask the NOC for attaching Cisco Guard on the server for 24 hours
(Normally this service is free from most NOCs)
2. Attach a hardware firewall for the server
Hope this will help you in such a situation, for more information kindly refer the following URL:
http://forums.cpanel.net/showthread.php?t=66952
kill -9 $(pgrep -u crothers)
We can use the following steps to recover our server from a DDOS attack on the port 80. To do this you must have logged into the server as a root user.
Step 1 : Install/Configure APF firewall
=============================
a) If there are no firewalls installed on the server please install the same,
you will get the steps and directions from the following site.
http://www.webhostgear.com/61.html
b) Turn on the antidos option (USE_AD) in the APF conf file
# vi /etc/apf/conf.apf
USE_AD = 1
Step 2 : Install/Configure mod_evasive (for Apache 1.3x)
=============================
mod_evasive and mod_dosevasive are the same
a) Install mod_evasive
# wget http://www.zdziarski.com/projects/mo..._1.10.1.tar.gz
# tar -xzvf mod_evasive_1.10.1.tar.gz
# cd mod_evasive
# /usr/local/apache/bin/apxs -i -a -c mod_evasive.c
# /etc/init.d/httpd restart
b) Also include the following lines in the apache conf file
# vi /usr/local/apache/conf/httpd.conf
-------------------------------------------------
DOSHashTableSize 3097
DOSPageCount 2
DOSSiteCount 50
DOSPageInterval 1
DOSSiteInterval 1
DOSBlockingPeriod 10
-------------------------------------------------
c) Restart the webserver
# /etc/init.d/httpd restart
Step 3 : Install mod_security
=============================
Normally we can find/install this module from WHM
WHM >> cPanel >> Addon Modules >> Select "modsecurity " >>save
Step 4 : Blocking IPs
a) Find the IPs those have established a connection with the server
(The following command is the better one to get the IPs, as this will sort the IPs
according to the number of connections).
===========================================================================
netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
===========================================================================
b) Block them using IPTABLES
iptables -I INPUT -s 81.134.13.35 -j DROP
service iptables save
service iptables restart
apf -d ip np
c) Block them on APF too
vi /etc/apf/deny_hosts.rules
service apf restart
Step 5 : Optimizing the httpd.conf file
=============================
# vi /usr/local/apache/conf/httpd.conf
Change the bellow options as follows, original values are shown in the
bracket.
MaxKeepAliveRequests 50 (100)
KeepAliveTimeout 60 (30)
Also edit the following options too, according to the situation.
Timeout
KeepAliv
MinSpareServers
MaxSpareServers
MaxClients
=============
Step 6 : Install/Configure 3rd party DDOS prevention tools
=============================
We can also use the most trusting 3rd party script 'DDoS-Deflate' for preventing DDOS attack effectively.
Steps to install this script are as follows.
# wget http://www.inetbase.com/scripts/ddos/install.sh
# sh install.sh
Add the script '/usr/local/ddos/ddos.sh' to cron as follows
# crontab -e
*/5 * * * * /usr/local/ddos/ddos.sh >/dev/null 2>&1
Step 7 : Suspend websites
=============================
Check the bandwidth usage of all the domains and suspend the high bandwidth consuming domains for a while
PERMANENT WAY TO FIX THE DDOS ATTACK
=============================
As we all know the softwares have its own limitations for preventing against DDOS attack, we can follow these steps to cure it permanently.
1. Ask the NOC for attaching Cisco Guard on the server for 24 hours
(Normally this service is free from most NOCs)
2. Attach a hardware firewall for the server
Hope this will help you in such a situation, for more information kindly refer the following URL:
http://forums.cpanel.net/showthread.php?t=66952
kill -9 $(pgrep -u crothers)
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