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Groups > comp.os.linux.networking > #4997

Re: incoming ssh blocked by ISP

From Marco Moock <invalid@invalid.invalid>
Newsgroups comp.os.linux.networking
Subject Re: incoming ssh blocked by ISP
Date 2021-11-07 12:44 +0100
Organization A noiseless patient Spider
Message-ID <20211107124451.4dd00de0@ryz> (permalink)
References <sm66vk$hvp$1@dont-email.me> <sm6af0$sst$1@dont-email.me> <sm6sb6$kru$1@dont-email.me> <sm6tj9$sst$2@dont-email.me>

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Am Sat, 6 Nov 2021 21:54:50 -0000 (UTC)
schrieb Lew Pitcher <lew.pitcher@digitalfreehold.ca>:

> Nonsense. If your ISP blocks /all/ inbound ports, then your system is
> effectively /not/ connected to the internet: both TCP and UDP require
> that /some/ port be open on each side of the conversation.
They can block "incoming" traffic by running a stateful package
inspection firewall that only allows incoming traffic on a port if a
package ha already been sent to the target. That is SPI firewalling.

For TCP, they can just block all incoming packages with no ACK flag
set, so you can properly connect to a server because the outgoing SYN
(only SYN flag set) can pass, but incoming such a package is being
dropped.

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Thread

incoming ssh blocked by ISP Bob Tennent <rdtennent@tennent.ca> - 2021-11-06 15:28 +0000
  Re: incoming ssh blocked by ISP Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2021-11-06 16:28 +0000
    Re: incoming ssh blocked by ISP Bob Tennent <rdtennent@tennent.ca> - 2021-11-06 21:33 +0000
      Re: incoming ssh blocked by ISP Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2021-11-06 21:54 +0000
        Re: incoming ssh blocked by ISP "Carlos E. R." <robin_listas@es.invalid> - 2021-11-06 23:13 +0100
          Re: incoming ssh blocked by ISP "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2021-11-06 19:16 -0400
            Re: incoming ssh blocked by ISP "Carlos E. R." <robin_listas@es.invalid> - 2021-11-07 00:28 +0100
        Re: incoming ssh blocked by ISP William Unruh <unruh@invalid.ca> - 2021-11-07 03:03 +0000
        Re: incoming ssh blocked by ISP Marco Moock <invalid@invalid.invalid> - 2021-11-07 12:44 +0100
      Re: incoming ssh blocked by ISP "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2021-11-06 17:57 -0400
        Re: incoming ssh blocked by ISP "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2021-11-06 18:01 -0400
          Re: incoming ssh blocked by ISP Bob Tennent <rdtennent@tennent.ca> - 2021-11-07 01:56 +0000
            Re: incoming ssh blocked by ISP Bob Tennent <rdtennent@tennent.ca> - 2021-11-07 21:21 +0000
              Re: incoming ssh blocked by ISP "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2021-11-07 19:05 -0500
                Re: incoming ssh blocked by ISP ant@zimage.comANT (Ant) - 2021-11-07 22:51 -0600
              Re: incoming ssh blocked by ISP Bob Tennent <rdtennent@tennent.ca> - 2021-11-08 01:18 +0000
                Re: incoming ssh blocked by ISP "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2021-11-07 21:25 -0500
                Re: incoming ssh blocked by ISP Bit Twister <BitTwister@mouse-potato.com> - 2021-11-07 23:35 -0600
      Re: incoming ssh blocked by ISP William Unruh <unruh@invalid.ca> - 2021-11-07 02:51 +0000
    Re: incoming ssh blocked by ISP "Carlos E. R." <robin_listas@es.invalid> - 2021-11-06 22:47 +0100
      Re: incoming ssh blocked by ISP Dan Purgert <dan@djph.net> - 2021-11-10 13:13 +0000
  Re: incoming ssh blocked by ISP "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2021-11-06 13:43 -0400
  Re: incoming ssh blocked by ISP Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-11-06 19:18 +0100
  Re: incoming ssh blocked by ISP Marco Moock <invalid@invalid.invalid> - 2021-11-06 19:35 +0100
    Re: incoming ssh blocked by ISP William Unruh <unruh@invalid.ca> - 2021-11-06 19:54 +0000
      Re: incoming ssh blocked by ISP Bob Tennent <rdtennent@tennent.ca> - 2021-11-06 21:18 +0000
        Re: incoming ssh blocked by ISP "Carlos E. R." <robin_listas@es.invalid> - 2021-11-06 22:47 +0100
          Re: incoming ssh blocked by ISP "Carlos E. R." <robin_listas@es.invalid> - 2021-11-06 23:56 +0100
        Re: incoming ssh blocked by ISP Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-11-06 23:44 +0100
          Re: incoming ssh blocked by ISP "Carlos E. R." <robin_listas@es.invalid> - 2021-11-06 23:54 +0100
            Re: incoming ssh blocked by ISP Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-11-07 10:07 +0100
        Re: incoming ssh blocked by ISP Marco Moock <invalid@invalid.invalid> - 2021-11-07 10:22 +0100
          Re: incoming ssh blocked by ISP Pascal Hambourg <pascal@plouf.fr.eu.org> - 2021-11-07 10:51 +0100
            Re: incoming ssh blocked by ISP Marco Moock <invalid@invalid.invalid> - 2021-11-07 11:09 +0100
  Re: incoming ssh blocked by ISP Joe Beanfish <joebeanfish@nospam.duh> - 2021-11-08 14:52 +0000
    Re: incoming ssh blocked by ISP Bob Tennent <rdtennent@tennent.ca> - 2021-11-14 16:42 +0000
      Re: incoming ssh blocked by ISP Marco Moock <mo01@posteo.de> - 2021-11-14 18:01 +0100
      Re: incoming ssh blocked by ISP "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2021-11-14 13:08 -0500
        Re: incoming ssh blocked by ISP Bob Tennent <rdtennent@tennent.ca> - 2021-11-14 19:20 +0000
          Re: incoming ssh blocked by ISP "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2021-11-14 15:06 -0500
            Re: incoming ssh blocked by ISP Bob Tennent <rdtennent@tennent.ca> - 2021-11-14 21:03 +0000
              Re: incoming ssh blocked by ISP "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2021-11-14 16:28 -0500
                Re: incoming ssh blocked by ISP ant@zimage.comANT (Ant) - 2021-11-15 04:19 -0600
                Re: incoming ssh blocked by ISP William Unruh <unruh@invalid.ca> - 2021-11-15 20:18 +0000
      Re: incoming ssh blocked by ISP ant@zimage.comANT (Ant) - 2021-11-15 04:18 -0600

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