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From:	"Zhu, Binbin (Nokia - CN/Hangzhou)" <binbin DOT zhu AT nokia DOT com>
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject:	ssh ControlMaster re-broken
Date:	Tue, 17 Nov 2015 12:46:25 +0000
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Hi,

It worked month ago, but it failed after reinstall.

1. Create shared session: ssh -vvv -nNf -o ControlMaster=yes -o ControlPath="$HOME/.ssh/ctl/%L-%r@%h:%p"  remote-host
Output in accepting new connection: 
$ debug1: multiplexing control connection
debug3: fd 5 is O_NONBLOCK
debug3: fd 5 is O_NONBLOCK
debug1: channel 1: new [mux-control]
debug3: channel_post_mux_listener: new mux channel 1 fd 5
debug3: mux_master_read_cb: channel 1: hello sent
debug3: mux_master_read_cb: channel 1 packet type 0x00000001 len 4
debug2: process_mux_master_hello: channel 1 slave version 4
debug3: mux_master_read_cb: channel 1 packet type 0x10000004 len 4
debug2: process_mux_alive_check: channel 1: alive check
debug3: mux_master_read_cb: channel 1 packet type 0x10000002 len 41
debug2: process_mux_new_session: channel 1: request tty 1, X 0, agent 0, subsys 0, term "xterm", cmd "", env 0
mm_receive_fd: no message header
process_mux_new_session: failed to receive fd 0 from slave

2. Client output:
$ ssh -vvv -o ControlPath="$HOME/.ssh/ctl/%L-%r@%h:%p" remote-host
OpenSSH_7.1p1, OpenSSL 1.0.2d 9 Jul 2015
debug2: fd 3 setting O_NONBLOCK
debug2: mux_client_hello_exchange: master version 4
debug3: mux_client_forwards: request forwardings: 0 local, 0 remote
debug3: mux_client_request_session: entering
debug3: mux_client_request_alive: entering
debug3: mux_client_request_alive: done pid = 10144
debug3: mux_client_request_session: session request sent
mux_client_request_session: read from master failed: Connection reset by peer
debug2: ssh_connect: needpriv 0

Could you help?

Br, Bin


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