Closing out ports??? Post: 28534

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Special Forums IP Networking Closing out ports??? Post 28534 by s93366 on Thursday 19th of September 2002 03:55:06 PM

09-19-2002

Registered User

Hi..

First of all.. Don't remove stuff from /etc/services.. thats not the
way to go!!!! If you have a backup of the original services file
i suggest you replace the one you modified with the orginal.. or simply copy it from
another box running the same OS and version...

Please tell me what os you are running ! That really helps..
To check for open ports try: netstat -a |grep LISTEN (should work
on most unixes)

you should check the /etc/inetd.conf
for services and comment them out.. example:

pop3 stream tcp nowait root /usr/sbin/popa3d popa3d

line in /etc/inetd.conf will enable POP3 mail services..
just comment it out to disable it with a
# sign in front like this!

#pop3 stream tcp nowait root /usr/sbin/popa3d popa3d

then find out the pid of inetd and run kill -HUP <PID_OF_INETD_HERE> or simply reboot the server...

You should also check your startup files f�r services (depends on OS and init type where to find them.. please tell me what os you are running. This could be done with the command: uname -a)

You could also checkout if there is a free firewall available for your unix/linux if you want more control of what to let in and out of a server.

Hope this helps some..

/Peter C

s93366

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LEARN ABOUT DEBIAN

micro_proxy

micro_proxy(8)						      System Manager's Manual						    micro_proxy(8)

NAME

       micro_proxy - really small HTTP/HTTPS proxy

SYNOPSIS

       micro_proxy

DESCRIPTION

       micro_proxy  is	a  very small HTTP/HTTPS proxy.  It runs from inetd, which means its performance is poor.  But for low-traffic sites, it's
       quite adequate.	It implements all the basic features of an HTTP/HTTPS proxy, in only 260 lines of code.

       To install it, add a line like this to /etc/inetd.conf:
	   webproxy  stream tcp nowait nobody  /usr/sbin/micro_proxy micro_proxy
       Make sure the path to the executable is correct.  Then add a line like this to /etc/services:
	   webproxy   port/tcp
       Change "port" to the port number you want to use - 3128, or whatever.  Then restart inetd by sending it a "HUP" signal, or rebooting.

       On some systems, inetd has a maximum spawn rate - if you try to run inetd services faster than a certain number of  times  per  minute,	it
       assumed	there's  either  a  bug of an attack going on and it shuts down for a few minutes.  If you run into this problem - look for syslog
       messages about too-rapid looping - you'll need to find out how to increase the limit.  Unfortunately this varies from OS to OS.	 On  Free-
       BSD,  you  add  a  "-R 10000" flag to inetd's initial command line.  On some Linux systems, you can set the limit on a per-service basis in
       inetd.conf, by changing "nowait" to "nowait.10000".

AUTHOR

       Copyright (C) 1999 by Jef Poskanzer <jef@mail.acme.com>. All rights reserved.

								   16 March 1999						    micro_proxy(8)