[Bug 1697] New: 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

           Summary: scp transfers from remote cygwin machine fail with ssh
                    versions >= 4.6
           Product: Portable OpenSSH
           Version: 4.6p1
          Platform: ix86
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: scp
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: cdavis at ingenuous.net


I am in France and try to load a 20 MB file from a server in
California. Thus from California to France.  In California, the server
is a Dell 2650, running WIndows 2000 with cygwin installed. The ssh
version on that machine is 4.7. The server sits on a DSL line with a
maximum up speed of 250 kbits/s. Down is 1.5 mbit.

In France, I run various versions of Ububtu and Redhat, or windows XP
sp3. In france I am also on a DSL line that is about 4 times faster
than the California one.

For several scenarios, the file transfer stalls transferring a large
file. It stalls after around 50 kBytes. For some other scenarios, the
file transfer succeeds.

the specific command used is this: scp
permsession at xxx.xxx.xxx.xxx:/cygdrive/m/mm/mmdev/* ./

For these setups in France, the transfer fails:

Centos 5.4   ssh version not known.
Ubuntu 9.10  ssh version 5.1
Ubuntu 7.10  ssh version 4.6

In these setups, the transfer succeeds:
Ubuntu 6.10 ssh version 4.3
Windows cygwin ssh version 4.7

I have tried this several times with several i86 computers in France
and three total WIn2k server computers in California and the problem is
100% reproducible.

Here may be a valuable clue:  I did the same experiment, but instead of
loading a big file from my server in California that sits on a DSL
line, I tried to download a big file from one of my nearly identical
servers at a data center in Chicago, again toward France.  In this
scenario, the transfer never fails. All setups work.

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