how to turn off ports

jimval7 · 03-03-2002, 02:52 PM

I need to know how to turn off certain ports off completely, for example, i went into the /etc/services file and commented our certain ports like telnet, smtp and a few others and rebooted but when I had my firewall tested, it said the ports were open, I tried telneting from another machine to my firewall and I get connection refused, so what i dont understand, why is the test saying telnet port is open if i commented it out from /etc/services file. This is what I did:

# telnet 23/tcp
# smtp 25/tcp mail

Anyhelp????

Scotty2435 · 03-03-2002, 10:50 PM

if you can't connect to with telnet yourself and get a connection refused sort of message your probably save. Download nmap to do your own port scan on yourself.

http://www.insecure.org/nmap

jimval7 · 03-04-2002, 12:20 AM

Thanks for the info Scotty, I ran nmap and for some reason i still have sunrpc, smtp, auth, and a few others opened even though i commented them out in /etc/services file. Is there another file that opens them?

hanzerik · 03-04-2002, 10:41 AM

What distro?

jimval7 · 03-04-2002, 10:58 AM

I have redhat 7.0 with kernel 2.4.17

hanzerik · 03-04-2002, 04:59 PM

use ntsysv to turn off those services. or go to /etc/rc.d/rc*.d (whatever runlevel your in) and rename the S**whatever** to .S**whatever**, your simply hiding the files from the init scripts. Reboot.

ryandelany · 03-06-2002, 11:07 PM

If you are going to rename the files in the /etc/rc.d/rc#.d directories, the better way to do it is rename from S##file to K##file. The K files are ignored, while the S files are parsed at startup and shutdown of the system.

Ryan

hanzerik · 03-07-2002, 07:59 AM

files that start with .S are ignored also