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Full Discussion: block telnet to specific port
Special Forums IP Networking block telnet to specific port Post 17865 by thomas.jones on Wednesday 20th of March 2002 07:51:00 PM
Old 03-20-2002
First of all, the standard telnet port is 23. If you have telnet enabled through inetd.conf...then it's probably the default port of 23. Now to stop port 80 access it's just a little different.

If you had a webserver available on your node....then a person telnetting to it will get the httpd system banner:

**********************
Whatever Linux v2.2.14
Apache vX.X.XX
etc.
**********************

They can then send a GET command using telnet to pull the HTML...this is exactly what a web browser does.


To stop someone from connecting to this port...all you have to do is go into inetd.conf and comment out the HTTP line....which should look something like this:

http stream tcp nowait nobody ?/var/www/server/httpd httpd

This will shutdown the daemon...or "service"......then no one will be able to connect to it. Restart the inetd daemon by issuing the following command:

killall -HUP inetd

BTW, you will NOT be able to block a telnet'd connection to your port....and allow a web browser. To the firewall, they are essentially the same traffic. [TCP from a 1024+ port]

HTH.
Last edited by thomas.jones; 03-20-2002 at 09:01 PM..
 

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LEARN ABOUT CENTOS

git-instaweb

GIT-INSTAWEB(1) 						    Git Manual							   GIT-INSTAWEB(1)

NAME

       git-instaweb - Instantly browse your working repository in gitweb

SYNOPSIS

       git instaweb [--local] [--httpd=<httpd>] [--port=<port>]
		      [--browser=<browser>]
       git instaweb [--start] [--stop] [--restart]

DESCRIPTION

       A simple script to set up gitweb and a web server for browsing the local repository.

OPTIONS

       -l, --local
	   Only bind the web server to the local IP (127.0.0.1).

       -d, --httpd
	   The HTTP daemon command-line that will be executed. Command-line options may be specified here, and the configuration file will be
	   added at the end of the command-line. Currently apache2, lighttpd, mongoose, plackup and webrick are supported. (Default: lighttpd)

       -m, --module-path
	   The module path (only needed if httpd is Apache). (Default: /usr/lib/apache2/modules)

       -p, --port
	   The port number to bind the httpd to. (Default: 1234)

       -b, --browser
	   The web browser that should be used to view the gitweb page. This will be passed to the git web--browse helper script along with the
	   URL of the gitweb instance. See git-web--browse(1) for more information about this. If the script fails, the URL will be printed to
	   stdout.

       start, --start
	   Start the httpd instance and exit. Regenerate configuration files as necessary for spawning a new instance.

       stop, --stop
	   Stop the httpd instance and exit. This does not generate any of the configuration files for spawning a new instance, nor does it close
	   the browser.

       restart, --restart
	   Restart the httpd instance and exit. Regenerate configuration files as necessary for spawning a new instance.

CONFIGURATION

       You may specify configuration in your .git/config

	   [instaweb]
		   local = true
		   httpd = apache2 -f
		   port = 4321
		   browser = konqueror
		   modulepath = /usr/lib/apache2/modules

       If the configuration variable instaweb.browser is not set, web.browser will be used instead if it is defined. See git-web--browse(1) for
       more information about this.

SEE ALSO

       gitweb(1)

GIT

       Part of the git(1) suite

Git 1.8.3.1							    06/10/2014							   GIT-INSTAWEB(1)
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