Disable common ports in linux

Check what services are running on the port lsof-I: 123. this 123 indicates the port number you want to view. disable ports not commonly used in LINUX and disable Port 111/etc/init. d/portmapstop close port 25/etc/init. d/sendmailsdrop disable port 631/etc/init. d/cupsstop close 9... view the services running on the port
Lsof-I: 123 this 123 represents the port number you want to view
Disable ports not commonly used in LINUX
Close Port 111
/Etc/init. d/portmap stop
Disable port 25
/Etc/init. d/sendmail srop
Close port 631
/Etc/init. d/cups stop
Close Port 958
/Etc/init. d/nfslock stop
Close Port 37540
/Etc/init. d/avahi-daemon stop
Chkconfig-level 345 service name off