I am using Cygwin stunnel 5.71 on Windows 11 to connect to 'ssh' into my Ubuntu server over 'stunnel'.
- The first time I ssh via stunnel it works fine The second time, I - try to connect, it hangs with 'ssh -v' showing only the initial local steps of connection: OpenSSH_9.5p1, OpenSSL 3.0.12 24 Oct 2023 debug1: Reading configuration data /home/myuser/.ssh/config debug1: Reading configuration data /etc/ssh_config debug1: Connecting to localhost [::1] port 2222. debug1: Connection established. debug1: identity file /home/myuser/.ssh/id_rsa type 0 debug1: identity file /home/myuser/.ssh/id_rsa-cert type -1 debug1: identity file /home/myuser/.ssh/id_ecdsa type -1 debug1: identity file /home/myuser/.ssh/id_ecdsa-cert type -1 debug1: identity file /home/myuser/.ssh/id_ecdsa_sk type -1 debug1: identity file /home/myuser/.ssh/id_ecdsa_sk-cert type -1 debug1: identity file /home/myuser/.ssh/id_ed25519 type -1 debug1: identity file /home/myuser/.ssh/id_ed25519-cert type -1 debug1: identity file /home/myuser/.ssh/id_ed25519_sk type -1 debug1: identity file /home/myuser/.ssh/id_ed25519_sk-cert type -1 debug1: identity file /home/myuser/.ssh/id_xmss type -1 debug1: identity file /home/myuser/.ssh/id_xmss-cert type -1 debug1: identity file /home/myuser/.ssh/id_dsa type -1 debug1: identity file /home/myuser/.ssh/id_dsa-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_9.5 and '/var/log/stunnel' on the Cygwin client failing early: LOG7[main]: Found 1 ready file descriptor(s) LOG7[main]: FD=4 events=0x1 revents=0x0 LOG7[main]: FD=8 events=0x1 revents=0x1 LOG7[main]: FD=10 events=0x1 revents=0x0 LOG7[main]: Service [ssh] accepted (FD=3) from ::1:52718 - If I connect a *third* (or more times), 'ssh -v' hangs with the same output as above, but there is *no* additional logging in '/var/log/stunnel' on the client. It thus is acting as if 'stunnel' on the Cygwin client itself somehow hangs/becomes unresponsive early in the second 'ssh' connection attempt. Note that the client '/usr/bin/stunnel/ process continues to run so it doesn't crash. Killing and relaunching /usr/bin/stunnel restarts the situation allowing me to ssh-over-stunel OK on the first attempt but again hanging on the 2nd and subsequent 'ssh' attempts Also, the 'stunnel' server on Ubuntu continues to run throughout since I can continue to ssh-over-stunnel into it from other machines. It doesn't *seem* to be a firewall problem, since it connects fine the first time. Nor does it seem to be a network or 'stunnel' server problem. Any ideas on why this is happening? -- 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