Port:

One of the most important things is to close all unneeded network ports and know which ports you leave open. Just because anyone can use the port as a door to enter inside your computer and hack your personal information. So you need to care about it and ensure about is there any unneeded or unnecessary port open.

To get the list of open ports run:

netstat –tulpn 

The output of this command will return something like this:

Active Internet connections (only servers)

Proto Recv-Q Send-Q Local Address               Foreign Address                           State                   PID/Program name

Services/ports that you may not want to leave running/open are:

Tool/Services		Port	Dependencies	Handle service
Sendmail	25		SMTP protocol	If you need the server to act as SMTP server for outgoing emails only then go to “Secure Sendmail” Section in this document. If you don’t need to use this server as SMTP server
Tool/Services	Port		Dependencies	Handle service
				in any way you can stop it by running:  service sendmail stop chkconfig sendmail off
Portmap (RPC)	111		Handles RPC calls Used by NFS client	service portmap stop chkconfig portmap off
Nfslock	TCP:32700 UDP:32768, 729		Used by NFS client	service nfslock stop chkconfig nfslock off
Cupsd	631		Printing service	service cups stop chkconfig cups off
Hplip/hpiod	2208		HP Linux Imaging and Printing	service hplip stop chkconfig hplip off
avahi-daemon	UDP:1024 , 5353, 1025		MDNS/DNS-SD Multicast DNS service Discovery	service avahi-daemon stop chkconfig avahi-daemon off

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