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Date: Fri, 23 Jun 2023 09:28:52 -0600
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Subject: Re: scp and ssh 'cat' stalls at 64k bytes
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From: Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
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Cc: Brian Inglis <Brian DOT Inglis AT Shaw DOT ca>, Chris Roehrig <croehrig AT house DOT org>
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On 2023-06-23 00:26, Chris Roehrig via Cygwin wrote:
> I've upgraded cygwin recently (from a much older version) and am encountering a 
> new problem on all my Win10/WIn11 machines.
> 
> With openssh and pv installed on cygwin (3.4.7-1):
> 
> dd if=/dev/zero bs=1 count=65536 | ssh localhost 'cat > /dev/null'    # works
> dd if=/dev/zero bs=1 count=65537 | ssh localhost 'cat > /dev/null'    # stalls 
> (and anything larger)
> dd if=/dev/zero bs=1 count=65537 | ssh localhost 'pv > /dev/null'    # replace 
> 'cat' with 'pv' and it works
> 
> This happens with or without Windows Firewall enabled, with any input > 64k, and 
> also remotely from Linux.
> It also seems to affect scp to cygwin which stalls if the file is >= 64k

In case equivalent Windows services are running, I check for, shut down, and 
disable the following Windows services I have seen, or seen warnings about, 
before trying to start Cygwin services:

	ssh ssh-agent sshbroker sshproxy sshd sshdbroker sshdproxy

Do you take similar precautions on the Windows systems with issues?

Please show at least the output of `uname -srvmo`, and if possible provide a 
text attachment of the output log from running `cygcheck -hrsv > cygcheck.out`, 
as suggested under the Problem reports link below.

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer     but when there is no more to cut
                                 -- Antoine de Saint-Exupéry


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