OpenSSH 7.8p1 drops SSH connection with "Broken Pipe" IMMEDIATELY after successful login

[Zach Cheung]

Sorry, your problem is related to ssh client not sshd, try to add following
config to /etc/ssh/ssh_config or ~/.ssh/config:
Host *
    IPQoS lowdelay throughput


On Wed, Aug 29, 2018 at 1:24 PM Ohad Frenkel <ohadfjunkbox at outlook.com>
wrote:

> Added the line as above: 'IPQoS lowdelay throughput', restarted the SSH
> service, tried SSH-ing and Git-ing... same error as before:
> 'packet_write_wait: Connection to X.X.X.X port 22: Broken pipe'.
> ------------------------------
> *From:* Zach Cheung <kuroro.zhang at gmail.com>
> *Sent:* 29 August 2018 07:17
> *To:* ohadfjunkbox at outlook.com
> *Cc:* dtucker at dtucker.net; openssh-unix-dev at mindrot.org
> *Subject:* Re: OpenSSH 7.8p1 drops SSH connection with "Broken Pipe"
> IMMEDIATELY after successful login
>
> Using for years doesn't mean it won't be its problem, would you try to add
> 'IPQoS lowdelay throughput' to 7.8p1 sshd_config and check whether fix
> the problem?
>
> On Wed, Aug 29, 2018 at 1:10 PM Ohad Frenkel <ohadfjunkbox at outlook.com>
> wrote:
>
> The virtualization is VMware Workstation 12.x, NOT Fusion.
> Again, I'd like to point that downgrading to 7.7p2 "solved" the issue and
> that I'm using the same virtualization software for ages (which makes me
> disbelieve the issue lies with it).
>
> I've seen the comment about zero-length passwords... I'm not techie enough
> to understand the code there (or the technical explanation), but it is true
> that my previous SSH keys were password-less (if that is the meaning of
> "zero-length password").
> I say "previous" because one of the first things I did, trying to solve
> this on my end, was to assume the problem was with the keys and thus
> generated a new set of keys, all of which have positive value of characters
> in the password (which, by the way, did not solve the case. As I said, only
> downgrading to 7.7p2 did the trick).
> ________________________________
> From: Darren Tucker <dtucker at dtucker.net>
> Sent: 28 August 2018 22:18
> To: Ohad Frenkel
> Cc: openssh-unix-dev at mindrot.org
> Subject: Re: OpenSSH 7.8p1 drops SSH connection with "Broken Pipe"
> IMMEDIATELY after successful login
>
> On 28 August 2018 at 13:36, Ohad Frenkel <ohadfjunkbox at outlook.com> wrote:
> >   *   OS: Antergos Linux (Fully updated daily) (Running as a guest on
> VM).
>
> If the VM host is VMWare Fusion, see
>
> https://lists.mindrot.org/pipermail/openssh-unix-dev/2018-August/037145.html
> wherein it appears to have a bug in its networking stack that chokes
> on the new default (valid) DSCP markings.  If so you can work around
> it by overriding the defaults, but the problem is within VMWare (maybe
> in general, or maybe just the Fusion product).
>
> --
> Darren Tucker (dtucker at dtucker.net)
> GPG key 11EAA6FA / A86E 3E07 5B19 5880 E860  37F4 9357 ECEF 11EA A6FA (new)
>     Good judgement comes with experience. Unfortunately, the experience
> usually comes from bad judgement.
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