LinuxQuestions.org - How do I Close or Disable a Port Without IPtables

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How do I Close or Disable a Port Without IPtables

Hi,
I need to disable or close a couple of ports on a RHEL 5.3 Redhat server, without using IPtables .IPtables is already switched off (disabled)on this system.Is there any alternative way of closing or disabling these ports either via command line or via changes in configuration files .

Your help would be greatly appreciated.

One way is in /etc/services (if that's what you're trying to do). Another is in /etc/inetd.conf (but inetd may not be on Redhat anymore?).

Take a look at this thread http://www.linuxquestions.org/questi...se-ports-1515/ for other suggestions.

Hope this helps some.

Under Linux and Unix operating systems, a port is only open if something is listening on that port. find the program listening on a port and stop that program, and you have closed that port.

What ports are you seeing open that you wish to close?

Quote:

Originally Posted by wpeckham (Post 4603257)

Under Linux and Unix operating systems, a port is only open if something is listening on that port. find the program listening on a port and stop that program, and you have closed that port.

and if you want you can use:

Code:

root@~#>netstat -tapln

Active Internet connections (servers and established)

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

tcp        0      0 192.168.0.5:53          0.0.0.0:*              LISTEN      15716/named        

tcp        0      0 127.0.0.1:53            0.0.0.0:*              LISTEN      15716/named        

tcp        0      0 127.0.0.1:953          0.0.0.0:*              LISTEN      15716/named        

tcp        0      0 0.0.0.0:25              0.0.0.0:*              LISTEN      16886/master        

tcp        0      0 :::22                  :::*                    LISTEN      5502/sshd          

tcp        0      0 ::1:953                :::*                    LISTEN      15716/named

to see what ports are opened by which service.