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  • Corrupted MAC on input

    From bob prohaska@3:770/3 to All on Thu Jan 18 00:54:17 2024
    I'm seeing errors like this on my RasPiOS Pi4 ssh client host:

    Connection closed by remote host
    Corrupted MAC on input.
    ssh_dispatch_run_fatal: Connection to 50.1.20.29 port 22:
    message authentication code incorrect

    They show up after a successful ssh login, usually shortly after,
    sometimes never. The connection can be re-started, but the error
    persists even after rebooting the remote host.

    It happens with some hosts and not others, I'm trying to figure
    out if it's my RasPiOS workstation or the clients (FreeBSD)
    reporting the error. The IP number shown is of the remote host,
    but which MAC is being complained about and by whom I can't tell.

    If anybody's seen this or has a clue please post!

    Thanks for reading,

    bob prohaska

    --- SoupGate-Win32 v1.05
    * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)
  • From Richard Kettlewell@3:770/3 to bob prohaska on Thu Jan 18 08:33:50 2024
    bob prohaska <bp@www.zefox.net> writes:
    I'm seeing errors like this on my RasPiOS Pi4 ssh client host:

    Connection closed by remote host
    Corrupted MAC on input.
    ssh_dispatch_run_fatal: Connection to 50.1.20.29 port 22:
    message authentication code incorrect

    A message received from the server was corrupted. Off the top of my
    head, possible causes include:

    - some fault in the network between the two endpoints
    - faulty network device on one endpoint or the other
    - faulty RAM on one endpoint or the other
    - software bug on end endpoint or the other (unlikely, everyone else
    would be impacted)

    They show up after a successful ssh login, usually shortly after,
    sometimes never. The connection can be re-started, but the error
    persists even after rebooting the remote host.

    It happens with some hosts and not others, I'm trying to figure
    out if it's my RasPiOS workstation or the clients (FreeBSD)
    reporting the error. The IP number shown is of the remote host,
    but which MAC is being complained about and by whom I can't tell.

    In this context ‘MAC’ means https://en.wikipedia.org/wiki/Message_authentication_code, not a network card’s MAC address.

    --
    https://www.greenend.org.uk/rjk/

    --- SoupGate-Win32 v1.05
    * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)
  • From bob prohaska@3:770/3 to Richard Kettlewell on Fri Jan 19 16:04:05 2024
    Richard Kettlewell <invalid@invalid.invalid> wrote:
    bob prohaska <bp@www.zefox.net> writes:
    I'm seeing errors like this on my RasPiOS Pi4 ssh client host:

    Connection closed by remote host
    Corrupted MAC on input.
    ssh_dispatch_run_fatal: Connection to 50.1.20.29 port 22:
    message authentication code incorrect

    A message received from the server was corrupted. Off the top of my
    head, possible causes include:

    - some fault in the network between the two endpoints
    - faulty network device on one endpoint or the other
    - faulty RAM on one endpoint or the other
    - software bug on end endpoint or the other (unlikely, everyone else
    would be impacted)

    They show up after a successful ssh login, usually shortly after,
    sometimes never. The connection can be re-started, but the error
    persists even after rebooting the remote host.

    It happens with some hosts and not others, I'm trying to figure
    out if it's my RasPiOS workstation or the clients (FreeBSD)
    reporting the error. The IP number shown is of the remote host,
    but which MAC is being complained about and by whom I can't tell.

    In this context ?MAC? means https://en.wikipedia.org/wiki/Message_authentication_code, not a network card?s MAC address.

    Ok, that clears up a profound confusion.

    Thank you very much for writing!

    bob prohaska

    --- SoupGate-Win32 v1.05
    * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)