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Re: Firewall blocking my new Debian 11 server ports 80 and 443

From Greg Wooledge <greg@wooledge.org>
Newsgroups linux.debian.user
Subject Re: Firewall blocking my new Debian 11 server ports 80 and 443
Date 2022-05-29 02:10 +0200
Message-ID <EseFj-ZTN-1@gated-at.bofh.it> (permalink)
References (1 earlier) <EsbR7-Yhw-7@gated-at.bofh.it> <Esd6x-YVu-7@gated-at.bofh.it> <Esd6x-YVu-5@gated-at.bofh.it> <Esdgd-YYq-9@gated-at.bofh.it> <Esdzz-Z4r-1@gated-at.bofh.it>
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On Sat, May 28, 2022 at 05:51:38PM -0500, Tom Browder wrote:
>     $ sudo su
>     # telnet 80
>     Trying 0.0.0.80...

... wow.  Just wow.  How can such a short excerpt contain so many failures?

1) "sudo su" is stupid.  You don't need TWO setuid programs to get a root
   shell.  Either use "sudo -s" or "su".  Hell, even "sudo bash" would
   make more sense and would be less wasteful.

2) As you can PLAINLY SEE in the output of telnet, you messed up the
   arguments.  You supplied "80" as a hostname/address, instead of a
   port number.  If you wanted to probe port 80 of your web server, you
   need to supply the web server's hostname/address as the first argument,
   and 80 (the port number) as the second argument.

3) You don't need to be root to telnet to another host (or the same host,
   if you're giving "localhost" as the hostname) in the first place.

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Thread

Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-28 21:20 +0200
  Re: Firewall blocking my new Debian 11 server ports 80 and 443 Dan Ritter <dsr@randomstring.org> - 2022-05-28 21:40 +0200
  Re: Firewall blocking my new Debian 11 server ports 80 and 443 Georgi Naplatanov <gosho@oles.biz> - 2022-05-28 21:50 +0200
  Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-28 22:00 +0200
  Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-28 23:10 +0200
    Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-29 00:30 +0200
      Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 17:00 +0200
        Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-29 17:00 +0200
          Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 17:30 +0200
            Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-29 17:40 +0200
              Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 18:30 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-29 18:40 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-29 18:40 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 19:30 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 john doe <johndoe65534@mail.com> - 2022-05-29 20:30 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-29 21:00 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Greg Wooledge <greg@wooledge.org> - 2022-05-29 21:30 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 22:50 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Greg Wooledge <greg@wooledge.org> - 2022-05-29 23:00 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-30 00:30 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 john doe <johndoe65534@mail.com> - 2022-05-30 09:20 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-30 14:20 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Greg Wooledge <greg@wooledge.org> - 2022-05-30 15:50 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-30 16:10 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-30 19:30 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2022-05-31 01:00 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-30 19:30 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Edwin Zimmerman <edwin@plainemail.net> - 2022-05-31 02:50 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-06-01 13:50 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 john doe <johndoe65534@mail.com> - 2022-06-01 18:30 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-06-01 19:20 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Lee <ler762@gmail.com> - 2022-05-30 02:00 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Greg Wooledge <greg@wooledge.org> - 2022-05-30 02:20 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2022-05-30 02:40 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-30 02:30 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Curt <curty@free.fr> - 2022-05-30 14:10 +0200
    Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 00:30 +0200
      Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-29 00:40 +0200
        Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 01:00 +0200
          Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 02:00 +0200
            Re: Firewall blocking my new Debian 11 server ports 80 and 443 Timothy M Butterworth <timothy.m.butterworth@gmail.com> - 2022-05-29 02:20 +0200
              Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 02:40 +0200
            Re: Firewall blocking my new Debian 11 server ports 80 and 443 Charles Kroeger <mbone@gmx.co.uk> - 2022-05-30 07:30 +0200
          Re: Firewall blocking my new Debian 11 server ports 80 and 443 Greg Wooledge <greg@wooledge.org> - 2022-05-29 02:10 +0200
            Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 02:20 +0200
          Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-29 03:10 +0200
            Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 04:00 +0200
            Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 12:50 +0200
              Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 13:30 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-29 14:10 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Tom Browder <tom.browder@gmail.com> - 2022-05-29 14:30 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-29 14:50 +0200
                Re: Firewall blocking my new Debian 11 server ports 80 and 443 Erwan David <erwan@rail.eu.org> - 2022-05-29 16:00 +0200
              Re: Firewall blocking my new Debian 11 server ports 80 and 443 IL Ka <kazakevichilya@gmail.com> - 2022-05-29 14:10 +0200
              Re: Firewall blocking my new Debian 11 server ports 80 and 443 <tomas@tuxteam.de> - 2022-05-29 19:00 +0200
    Re: Firewall blocking my new Debian 11 server ports 80 and 443 Dan Ritter <dsr@randomstring.org> - 2022-05-29 00:30 +0200

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