Call for testing: OpenSSH 8.0

Adam Eijdenberg adam.eijdenberg at
Wed Apr 3 11:56:21 AEDT 2019

Sigh - I think the issue may lie closer to my end. Something that I
did not mention, as it didn't seem relevant at the time, is that I'm
doing my testing from an Ubuntu running inside a VMware VM on a
Windows host.

Now we know it's an IPQoS issue, I've found the following, suggesting
it might be a VMware networking issue:

Sorry for the noise.

On Wed, Apr 3, 2019 at 10:00 AM Damien Miller <djm at> wrote:
> On Wed, 3 Apr 2019, Adam Eijdenberg wrote:
> > On Wed, Apr 3, 2019 at 9:43 AM Damien Miller <djm at> wrote:
> > > Could you try turning off IPQoS setting (ssh -oIPQoS=none ...) and seeing
> > > whether that makes any difference?
> >
> > Yes - setting -oIPQoS=none on the client allows for a successful
> > connection to the server.
> >
> > Would you still like me to check on the other things or is that enough
> > to go on with?
> No - it looks like a middlebox in Amazon's network might be getting confused
> when the DSCP value changes during the connection.
> Thanks a lot for helping to chase this down.
> Cheers,
> Damien

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