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Re: ssh fingerprint mismatch for one single client

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On 2020-09-19 22:28, Beco wrote:
> Dear linuxers,
> 
> I've a server and one of my students is getting a wrong fingerprint 
> when
> trying to connect via SSH.
> 
> After a lot of debug, we are still unable to pinpoint why.
> 
> The server didn't change IP or keys, and other students still log in ok
> with the correct fingerprint. Just one student, let's call him Bob 
> (because
> why not), is not getting through.
> 
> I've asked Bob to try a different machine, which he does not have, 
> being a
> poor student. But he had a mobile, so after trying the app juiceSSH and
> wifi on, he again got the wrong fingerprint.
> 
> I asked him to turn the wifi off for the mobile and yes, he got the 
> correct
> fingerprint.
> 
> I also asked him to run a full antivirus scan in his notebook (windows) 
> and
> nothing was found.
> 
> He also hard-reseted the router, still the problem continues.
> 
> He called the ISP for any clues, but it is a small company who doesn't 
> know
> the word "fingerprint" neither in english nor in their native language. 
> So,
> not much help there.
> 
> I also asked him to check if his IP is what he think it is, and he 
> checked
> with one of these "what is my IP" website and it is ok.
> 
> As for DNS, I asked him to try to ssh directly using the server's IP
> instead of the name, but still the wrong fingerprint.
> 
> Kinda crazy, right? I run out of ideas...
> 
> What else should I try to help that student?
> 
> Thanks
> Beco

Just wild guess.
Student can connect via the mobile network but not through the ISP 
router?
Might that be the port for ssh on the router ?

mick

-- 
Key ID    4BFEBB31

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Thread

ssh fingerprint mismatch for one single client Beco <rcb@beco.cc> - 2020-09-19 23:30 +0200
  Re: ssh fingerprint mismatch for one single client Lucas Castro <lucas@gnuabordo.com.br> - 2020-09-19 23:50 +0200
    Re: ssh fingerprint mismatch for one single client Beco <rcb@beco.cc> - 2020-09-20 00:40 +0200
  Re: ssh fingerprint mismatch for one single client mick crane <mick.crane@gmail.com> - 2020-09-20 00:00 +0200
    Re: ssh fingerprint mismatch for one single client Beco <rcb@beco.cc> - 2020-09-20 00:50 +0200
      Re: ssh fingerprint mismatch for one single client mick crane <mick.crane@gmail.com> - 2020-09-20 05:40 +0200
      Re: ssh fingerprint mismatch for one single client David Christensen <dpchrist@holgerdanske.com> - 2020-09-20 08:00 +0200
  Re: ssh fingerprint mismatch for one single client Reco <recoverym4n@enotuniq.net> - 2020-09-20 10:50 +0200
    Re: ssh fingerprint mismatch for one single client Beco <rcb@beco.cc> - 2020-09-20 19:10 +0200
      Re: ssh fingerprint mismatch for one single client Beco <rcb@beco.cc> - 2020-09-20 19:20 +0200
      Re: ssh fingerprint mismatch for one single client Reco <recoverym4n@enotuniq.net> - 2020-09-20 19:30 +0200
      Re: ssh fingerprint mismatch for one single client Fabien Roucaute <fabien.roucaute@free.fr> - 2020-09-20 20:40 +0200
      Re: ssh fingerprint mismatch for one single client tomas@tuxteam.de - 2020-09-21 09:20 +0200
        (solved) Re: ssh fingerprint mismatch for one single client Beco <rcb@beco.cc> - 2020-09-23 02:00 +0200
  Re: ssh fingerprint mismatch for one single client <tomas@tuxteam.de> - 2020-09-20 10:50 +0200

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