[Bug 1697] scp transfers from remote cygwin machine fail with ssh versions >= 4.6

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1697

--- Comment #4 from Charles Davis <cdavis at ingenuous.net> 2010-01-14 17:39:36 EST ---
(In reply to comment #3)
In reply to comment #2)
> > This:
> >  "echo 0 >/proc/sys/net/ipv4/tcp_window_scaling"
> > completely fixes the problem. Thanks loads. 
> 
> You're welcome.
> 
> What type of ADSL device is it, so that we can add it to the mental
> list of broken ones?
> 
Its some sort of Cisco router. When I disabled its firewall, the
problem went away. Further screwing around with the firewall has caused
me to get myself locked out from the installation, hence the lack of
detail. When I get back in I'll provide specifics. THanks again.


> I suspect it's creating a firewall state only in the ethernet -> ADSL
> direction, and since the window scale option is only on the first
> packet, when you connect from outside the state doesn't know the
> connection has window scaling and thus gets the TCP windows wrong.  If
> this is the case, you would see that scping out would work (ie the same
> data transfer direction but initiated from the other end).
> 
> > As far as I am concerned it is fixed. So I am changing the status.
> > 
> > However, before I came to you fellows, I searched extensively and there
> > seems to ba a lot of instances of this problem. Is there somewhere I
> > can add a FAQ or soemthing like that??
> 
> There's http://www.openssh.com/faq.html.  If you want to write
> something I'll be happy to review and/or add it, but it's not a very
> common problem (or at least, it's likely that the network brokenness
> would be noticed long before anyone starts trying to scp files around).

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