> -----Original Message----- > From: Adam Dinwoodie > Sent: Monday, January 17, 2022 11:30 AM > > The SSH connection sharing function in Cygwin's openssh release, using > `ssh -M` or the ssh_config.5 ControlMaster configuration, doesn't appear > to work. Setting up a master connection seems fine, but subsequent SSH
Sadly, it is a known issue. https://stackoverflow.com/questions/20959792/is-ssh-controlmaster-with-cygwin-on-windows-actually-possible/21439862#21439862 We would be happy to thrown some $ or beer at it. > sessions that should reuse master connection instead set up their own > session, with an error stating "mux_client_request_session: read from > master failed: Connection reset by peer". > > Simple testcase attached, which creates a master connection, starts a > long sleep in a second SSH session, then terminates the master > connection. When I run this on one of my Debian boxes, the script takes > about 6s to run, as tearing down the master connection terminates the > long-running command. When run from Cygwin, however, the script takes > about 64s, as the second SSH session creates an independent connection > that's unaffected by the master connection terminating. > > On Debian: > > ``` > $ time bash test.sh adam@192.168.1.131 > Master running (pid=7008) > > Exit request sent. > > real 0m6.048s > user 0m0.083s > sys 0m0.111s > ``` > > On Cygwin: > > ``` > $ time bash test.sh adam@192.168.1.131 > Master running (pid=5079) > mux_client_request_session: read from master failed: Connection reset by peer > > Exit request sent. > finishing > > real 1m4.071s > user 0m0.106s > sys 0m0.540s > ``` > > Slightly redacted `cygcheck -srv` output also attached. > > Adam -- Jason Pyeron | Architect PD Inc | Certified SBA 8(a) 10 w 24th St | Certified SBA HUBZone Baltimore, MD | CAGE Code: 1WVR6 .mil: jason.j.pyeron....@mail.mil .com: jpye...@pdinc.us tel : 202-741-9397 -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
