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	Feb 2022 09:15:55 -0800 (PST)
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From:	Sanjay Gupta <sanjay92 AT gmail DOT com>
Date:	Sat, 19 Feb 2022 09:15:43 -0800
Message-ID:	<CANbXC7Mi8u=p7+34=OqFowzF+kqgKdnJ-anh4sGjaun3vQQz8g@mail.gmail.com>
Subject:	cygwin ssh connection from mac to windows Connection closed by
	XX.XX.XXX.XX port 22
To:	cygwin AT cygwin DOT com
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Cygwin SSH Server runs on Win 10. SSH is running as a service and using
local system account as Logon property.

I can successfully login using putty on Win 10 ( connection to localhost
and providing password when asked) so this works.

Same when I try to connect from MAC, I get error Connection closed by
XX.XX.XXX.XX port 22

ssh -v -v -v  user AT mypc DOT com
OpenSSH_8.1p1, LibreSSL 2.7.3
debug1: Reading configuration data /Users/macuser/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 47: Applying options for *
debug1: /etc/ssh/ssh_config line 51: Applying options for *
debug1: Connecting to mypc.com port 22.
debug1: Connection established.
debug1: identity file /Users/macuser/.ssh/id_rsa type 0
debug1: identity file /Users/macuser/.ssh/id_rsa-cert type -1
debug1: identity file /Users/macuser/.ssh/id_dsa type -1
debug1: identity file /Users/macuser/.ssh/id_dsa-cert type -1
debug1: identity file /Users/macuser/.ssh/id_ecdsa type -1
debug1: identity file /Users/macuser/.ssh/id_ecdsa-cert type -1
debug1: identity file /Users/macuser/.ssh/id_ed25519 type -1
debug1: identity file /Users/macuser/.ssh/id_ed25519-cert type -1
debug1: identity file /Users/macuser/.ssh/id_xmss type -1
debug1: identity file /Users/macuser/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.8
debug1: match: OpenSSH_8.8 pat OpenSSH* compat 0x04000000
debug3: fd 5 is O_NONBLOCK
debug1: Authenticating to mypc.com:22 as 'user'
debug3: hostkeys_foreach: reading file "/Users/macuser/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file
/Users/macuser/.ssh/known_hosts:311
debug3: load_hostkeys: loaded 1 keys from mypc.com
debug3: order_hostkeyalgs: prefer hostkeyalgs:
ecdsa-sha2-nistp256-cert-v01 AT openssh DOT com,ecdsa-sha2-nistp384-cert-v01 AT openssh DOT com,ecdsa-sha2-nistp521-cert-v01 AT openssh DOT com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms:
curve25519-sha256,curve25519-sha256 AT libssh DOT org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms:
ecdsa-sha2-nistp256-cert-v01 AT openssh DOT com,ecdsa-sha2-nistp384-cert-v01 AT openssh DOT com,ecdsa-sha2-nistp521-cert-v01 AT openssh DOT com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519-cert-v01 AT openssh DOT com,rsa-sha2-512-cert-v01 AT openssh DOT com,rsa-sha2-256-cert-v01 AT openssh DOT com,ssh-rsa-cert-v01 AT openssh DOT com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos:
chacha20-poly1305 AT openssh DOT com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm AT openssh DOT com,aes256-gcm AT openssh DOT com
debug2: ciphers stoc:
chacha20-poly1305 AT openssh DOT com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm AT openssh DOT com,aes256-gcm AT openssh DOT com
debug2: MACs ctos:
umac-64-etm AT openssh DOT com,umac-128-etm AT openssh DOT com,hmac-sha2-256-etm AT openssh DOT com,hmac-sha2-512-etm AT openssh DOT com,hmac-sha1-etm AT openssh DOT com,umac-64 AT openssh DOT com,umac-128 AT openssh DOT com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc:
umac-64-etm AT openssh DOT com,umac-128-etm AT openssh DOT com,hmac-sha2-256-etm AT openssh DOT com,hmac-sha2-512-etm AT openssh DOT com,hmac-sha1-etm AT openssh DOT com,umac-64 AT openssh DOT com,umac-128 AT openssh DOT com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib AT openssh DOT com,zlib
debug2: compression stoc: none,zlib AT openssh DOT com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms:
curve25519-sha256,curve25519-sha256 AT libssh DOT org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group1-sha1,diffie-hellman-group-exchange-sha1
debug2: host key algorithms:
rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos:
chacha20-poly1305 AT openssh DOT com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm AT openssh DOT com,aes256-gcm AT openssh DOT com
debug2: ciphers stoc:
chacha20-poly1305 AT openssh DOT com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm AT openssh DOT com,aes256-gcm AT openssh DOT com
debug2: MACs ctos:
umac-64-etm AT openssh DOT com,umac-128-etm AT openssh DOT com,hmac-sha2-256-etm AT openssh DOT com,hmac-sha2-512-etm AT openssh DOT com,hmac-sha1-etm AT openssh DOT com,umac-64 AT openssh DOT com,umac-128 AT openssh DOT com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc:
umac-64-etm AT openssh DOT com,umac-128-etm AT openssh DOT com,hmac-sha2-256-etm AT openssh DOT com,hmac-sha2-512-etm AT openssh DOT com,hmac-sha1-etm AT openssh DOT com,umac-64 AT openssh DOT com,umac-128 AT openssh DOT com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib AT openssh DOT com
debug2: compression stoc: none,zlib AT openssh DOT com
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305 AT openssh DOT com MAC:
<implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305 AT openssh DOT com MAC:
<implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256
SHA256:oD2hFa/JcjHe/xayDBUYl1my190rrIGcKIniYl+hpfA
debug3: hostkeys_foreach: reading file "/Users/macuser/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file
/Users/macuser/.ssh/known_hosts:311
debug3: load_hostkeys: loaded 1 keys from mypc.com
debug3: hostkeys_foreach: reading file "/Users/macuser/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file
/Users/macuser/.ssh/known_hosts:311
debug3: load_hostkeys: loaded 1 keys from 10.60.193.69
debug1: Host 'mypc.com' is known and matches the ECDSA host key.
debug1: Found key in /Users/macuser/.ssh/known_hosts:311
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey in after 134217728 blocks
debug1: Will attempt key: /Users/macuser/.ssh/id_rsa RSA
SHA256:+7RTuPPGLQgUGUIU+fdAoxnhvZ1cy77GTzniJV8qyWQ
debug1: Will attempt key: /Users/macuser/.ssh/id_dsa
debug1: Will attempt key: /Users/macuser/.ssh/id_ecdsa
debug1: Will attempt key: /Users/macuser/.ssh/id_ed25519
debug1: Will attempt key: /Users/macuser/.ssh/id_xmss
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info:
server-sig-algs=<ssh-ed25519,sk-ssh-ed25519 AT openssh DOT com,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp256 AT openssh DOT com,webauthn-sk-ecdsa-sha2-nistp256 AT openssh DOT com>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue:
publickey,password,keyboard-interactive
debug3: start over, passed a different list
publickey,password,keyboard-interactive
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /Users/macuser/.ssh/id_rsa RSA
SHA256:+7RTuPPGLQgUGUIU+fdAoxnhvZ1cy77GTzniJV8qyWQ
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
Connection closed by XX.XX.XXX.XX port 22

Interestingly, if I stop windows service and manually run
/usr/sbin/sshd.exe -D and then I try to connect from MAC, it works So
obviously looks like some issue with service and may be system account. But
then I have changed service to run as my Domain account but same issue

I have also uninstalled and reinstalled sshd service couple of times as
well but did not help issue. I have also checked whether port no 22 is
getting blocked or not but does not seems like it.

telnet mycygwinserver.com 22
Trying XX.XX.XXX.XX...
Connected to mycygwinserver.com.
Escape character is '^]'.
SSH-2.0-OpenSSH_8.8


Enabled syslog-ng and sshd_config log level to debug3

Feb 18 21:18:34 USL37BCPC2 sshd: PID 1188: debug3: mm_key_allowed:
entering [preauth]
Feb 18 21:18:34 USL37BCPC2 sshd: PID 1188: debug3: mm_request_send:
entering, type 22 [preauth]
Feb 18 21:18:34 USL37BCPC2 sshd: PID 1188: debug3: mm_key_allowed:
waiting for MONITOR_ANS_KEYALLOWED [preauth]
Feb 18 21:18:34 USL37BCPC2 sshd: PID 1188: debug3:
mm_request_receive_expect: entering, type 23 [preauth]
Feb 18 21:18:34 USL37BCPC2 sshd: PID 1188: debug3: mm_request_receive:
entering [preauth]
Feb 18 21:18:34 USL37BCPC2 sshd: PID 1188: debug3: mm_request_receive: entering
Feb 18 21:18:34 USL37BCPC2 sshd: PID 1188: debug3: monitor_read:
checking request 22
Feb 18 21:18:34 USL37BCPC2 sshd: PID 1188: debug3:
mm_answer_keyallowed: entering
Feb 18 21:18:34 USL37BCPC2 sshd: PID 1188: debug1:
temporarily_use_uid: 4270411484/4266656257 (e=18/18)
Feb 18 21:18:36 USL37BCPC2 sshd: PID 1188: fatal: seteuid 4270411484:
No such device or address
Feb 18 21:18:36 USL37BCPC2 sshd: PID 1188: debug1: do_cleanup
Feb 18 21:18:36 USL37BCPC2 sshd: PID 1188: debug1: Killing privsep child 1189


Any idea why am I having issues with service vs manual running ?

-- 

Thanks
Sanjay Gupta

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