Iptables firewall on Debian

Iptables provide filtering, NAT and other packet mangling. Viewing current configuration iptables -L Output will be like Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination Storing iptables rules in a file nano -w... [ Continue reading... ]

Uninstalling apf firewall

All you need is to run following commands

service iptables stop

chkconfig apf off

/bin/rm -rfv /etc/apf

/bin/rm -fv /etc/cron.daily/fw

/bin/rm -fv /etc/init.d/apf

iptables -L -n

APF: unable to load iptables module (ip_tables), aborting

If you are getting error on apf unable to load iptables module (ip_tables), aborting It means, your kernel is compiled with iptables statically instead of as a module, and you will need to change this in the /etc/apf/conf.apf MONOKERN="0" Set it to "1" So open /etc/apf/conf.apf file and modify it restart the apf service and you wont see that... [ Continue reading... ]

Install APF firewall in Linux

firewall is always very important for the security of your system, specially if you are running a web server running very popular websites then firewall is the life of your server. Previously I explained how to install CSF firewall, and here is the tutorial for APF which is another great firewall available. cd /usr/local/src/ wget http://www.rfxnetworks.com/downloads/apf-current.tar.gz tar -zxvf apf-current.tar.gz; cd apf-* sh... [ Continue reading... ]

Ports to configure in firewall for Plesk

Previously I explained the list of ports to configure in firewall if you are running direct admin in your web servers. Ports to configure in firewall for Directadmin Here is the list of ports which are required to configure if you are running plesk control panel. #20 ftp-data #21 ftp #22 ssh #25 smtp #53 dns (TCP and UDP) #80 http #106 poppassd (for localhost only) #110 pop3 #113 auth #143 imap #443 https #465 smtps #990... [ Continue reading... ]

CSF on DirectAdmin

There was a time when I was about to select a firewall for a server which had DirectAdmin installed and I choosed CSF. CSF is one of the best firewall available for hosting servers. Installation of CSF in directAdmin is really easy, just download csf. Extract it and Install it Just a 3 step installation. Login to server via ssh, Download csf using wget Run ./install.directadmin.sh and it will automatically install and will... [ Continue reading... ]

perl error in CSF installation

[root@mailserver csf]# service csf status Status of csf:Can't locate LWP/UserAgent.pm in @INC (@INC contains: /usr/local/cpanel /etc/csf /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl /usr/lib64/perl5/vendor_perl/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl /usr/lib64/perl5/5.8.8/x86_64-linux-thread-multi /usr/lib/perl5/5.8.8 .) at... [ Continue reading... ]

ip_conntrack table is full and dropping packets

Last day one of our server had an attack, attack was not so big but still server was unresponsive because of this. After some research I found that this is because of iptables which are being load while handling so much traffic. Then I found a good article on the same issue which you can read by clicking below linking here. [ Continue reading... ]

Installing & configuring shorewall firewall in Ubuntu/Debian

Shore line firewall known as "Shorewall", it is a very high level firewall and very easy to install and ocnfigure How to install :- sudo apt-get install shorewall configuring shorewall startup service :- nano /etc/default/shorewall #Now simply change the line below from 0 to 1 startup = 0 to startup = 1 #save, and exit. Shorewall configuration files are stored in two separate places /etc/shorewall stores all the program... [ Continue reading... ]