Bug#1087627: openssh-client: Session dies (quickly)

Hello Colin,
Am Sat, Nov 16, 2024 at 01:36:16PM +0000 schrieb Colin Watson:
> I think this is quite likely to be a network-level problem rather than
> anything to do with OpenSSH.  But perhaps running with at least `ssh -v`
> (or `ssh -vvv` if the extra output isn't too annoying) would at least
> get a bit more information.

Here it is:

OpenSSH_9.9p1 Debian-3, OpenSSL 3.3.2 3 Sep 2024
debug1: Reading configuration data /home/helge/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug3: /etc/ssh/ssh_config line 19: Including file /etc/ssh/ssh_config.d/20-systemd-ssh-proxy.conf depth 0
debug1: Reading configuration data /etc/ssh/ssh_config.d/20-systemd-ssh-proxy.conf
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug2: resolve_canonicalize: hostname 142.132.201.35 is address
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/home/helge/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/home/helge/.ssh/known_hosts2'
debug3: channel_clear_timeouts: clearing
debug3: ssh_connect_direct: entering
debug1: Connecting to xxx.xxx.xxx.xx [xxx.xxx.xxx.xx] port xxx.
debug3: set_sock_tos: set socket 3 IP_TOS 0x10
debug1: Connection established.
debug1: identity file /home/helge/.ssh/id_rsa type 0
debug1: identity file /home/helge/.ssh/id_rsa-cert type -1
debug1: identity file /home/helge/.ssh/id_ecdsa type -1
debug1: identity file /home/helge/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/helge/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/helge/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/helge/.ssh/id_ed25519 type -1
debug1: identity file /home/helge/.ssh/id_ed25519-cert type -1
debug1: identity file /home/helge/.ssh/id_ed25519_sk type -1
debug1: identity file /home/helge/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/helge/.ssh/id_xmss type -1
debug1: identity file /home/helge/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_9.9p1 Debian-3
debug1: Remote protocol version 2.0, remote software version OpenSSH_9.2p1 Debian-2+deb12u3
debug1: compat_banner: match: OpenSSH_9.2p1 Debian-2+deb12u3 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to xxx.xxx.xxx.xx:xxx as 'root'
debug3: put_host_port: [xxx.xxx.xxx.xx]:xxx
debug1: load_hostkeys: fopen /home/helge/.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug3: order_hostkeyalgs: no algorithms matched; accept original
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: sntrup761x25519-sha512,[email protected],mlkem768x25519-sha256,curve25519-sha256,[email protected],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,ext-info-c,[email protected]
debug2: host key algorithms: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],rsa-sha2-512,rsa-sha2-256
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: [email protected],curve25519-sha256,[email protected],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,[email protected]
debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug3: kex_choose_conf: will use strict KEX ordering
debug1: kex: algorithm: [email protected]
debug1: kex: host key algorithm: ssh-ed25519
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: SSH2_MSG_KEX_ECDH_REPLY received
debug1: Server host key: ssh-ed25519 SHA256:kXl9iIcs7C8KUlLYMGpyZk6XvfwSoY1gTtMaE5CCI90
debug3: put_host_port: [xxx.xxx.xxx.xx]:xxx
debug3: put_host_port: [xxx.xxx.xxx.xx]:xxx
debug1: load_hostkeys: fopen /home/helge/.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: checking without port identifier
debug3: record_hostkey: found key type ED25519 in file /home/helge/.ssh/known_hosts:64
debug3: record_hostkey: found key type ECDSA in file /home/helge/.ssh/known_hosts:65
debug3: load_hostkeys_file: loaded 2 keys from 142.132.201.35
debug1: load_hostkeys: fopen /home/helge/.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: Host '142.132.201.35' is known and matches the ED25519 host key.
debug1: Found key in /home/helge/.ssh/known_hosts:64
debug1: found matching key w/out port
debug1: check_host_key: hostkey not known or explicitly trusted: disabling UpdateHostkeys
debug3: send packet: type 21
debug1: ssh_packet_send2_wrapped: resetting send seqnr 3
debug2: ssh_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: ssh_packet_read_poll2: resetting read seqnr 3
debug1: SSH2_MSG_NEWKEYS received
debug2: ssh_set_newkeys: mode 0
debug1: rekey in after 134217728 blocks
debug2: KEX algorithms: sntrup761x25519-sha512,[email protected],mlkem768x25519-sha256,curve25519-sha256,[email protected],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,ext-info-c,[email protected]
debug2: host key algorithms: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],rsa-sha2-512,rsa-sha2-256
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug3: kex_input_ext_info: extension server-sig-algs
debug1: kex_ext_info_client_parse: server-sig-algs=<ssh-ed25519,[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],ssh-dss,ssh-rsa,rsa-sha2-256,rsa-sha2-512>
debug3: kex_input_ext_info: extension [email protected]
debug1: kex_ext_info_check_ver: [email protected]=<0>
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
debug3: start over, passed a different list publickey,password
debug3: preferred gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug3: ssh_get_authentication_socket_path: path '/tmp/ssh-aWriIU4iFy8r/agent.4193'
debug1: get_agent_identities: bound agent to hostkey
debug1: get_agent_identities: agent returned 1 keys
debug1: Will attempt key: /home/helge/.ssh/id_rsa RSA SHA256:13RSKhUDFSFltlcG0ferrLX3fQw3kJnAROitMQ1IRpI agent
debug1: Will attempt key: /home/helge/.ssh/id_ecdsa 
debug1: Will attempt key: /home/helge/.ssh/id_ecdsa_sk 
debug1: Will attempt key: /home/helge/.ssh/id_ed25519 
debug1: Will attempt key: /home/helge/.ssh/id_ed25519_sk 
debug1: Will attempt key: /home/helge/.ssh/id_xmss 
debug2: pubkey_prepare: done
debug1: Offering public key: /home/helge/.ssh/id_rsa RSA SHA256:13RSKhUDFSFltlcG0ferrLX3fQw3kJnAROitMQ1IRpI agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: /home/helge/.ssh/id_rsa RSA SHA256:13RSKhUDFSFltlcG0ferrLX3fQw3kJnAROitMQ1IRpI agent
debug3: sign_and_send_pubkey: using [email protected] with RSA SHA256:13RSKhUDFSFltlcG0ferrLX3fQw3kJnAROitMQ1IRpI
debug3: sign_and_send_pubkey: signing using rsa-sha2-512 SHA256:13RSKhUDFSFltlcG0ferrLX3fQw3kJnAROitMQ1IRpI
debug3: send packet: type 50
debug3: receive packet: type 52
Authenticated to xxx.xxx.xxx.xx ([xxx.xxx.xxx.xx]:xxx) using "publickey".
debug2: fd 6 setting O_NONBLOCK
debug1: channel 0: new session [client-session] (inactive timeout: 0)
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting [email protected]
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: client_repledge: enter
debug3: receive packet: type 80
debug1: client_input_global_request: rtype [email protected] want_reply 0
debug3: receive packet: type 4
debug1: Remote: /root/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
debug3: receive packet: type 4
debug1: Remote: /root/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: fd 3 setting TCP_NODELAY
debug3: set_sock_tos: set socket 3 IP_TOS 0x10
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug1: Sending environment.
debug3: Ignored env SHELL
debug3: Ignored env SSH_AUTH_SOCK
debug3: Ignored env CREDENTIALS_DIRECTORY
debug3: Ignored env BSTINPUTS
debug3: Ignored env MEMORY_PRESSURE_WRITE
debug3: Ignored env SSH_AGENT_PID
debug3: Ignored env MFINPUTS
debug3: Ignored env XDG_SEAT
debug3: Ignored env PWD
debug3: Ignored env LOGNAME
debug3: Ignored env XDG_SESSION_TYPE
debug3: Ignored env TEXINPUTS
debug3: Ignored env SYSTEMD_EXEC_PID
debug3: Ignored env MOTD_SHOWN
debug3: Ignored env HOME
debug1: channel 0: setting env LANG = "de_DE.UTF-8"
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env LS_COLORS
debug3: Ignored env MEMORY_PRESSURE_WATCH
debug3: Ignored env BIBINPUTS
debug3: Ignored env DEBEMAIL
debug3: Ignored env INVOCATION_ID
debug3: Ignored env XDG_SESSION_CLASS
debug3: Ignored env TERM
debug3: Ignored env USER
debug3: Ignored env SHLVL
debug3: Ignored env XDG_VTNR
debug3: Ignored env XDG_SESSION_ID
debug3: Ignored env XDG_RUNTIME_DIR
debug1: channel 0: setting env LC_ALL = "de_DE.UTF-8"
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env PATH
debug3: Ignored env DBUS_SESSION_BUS_ADDRESS
debug3: Ignored env MAIL
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug3: client_repledge: enter
debug1: pledge: fork
debug2: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
debug3: obfuscate_keystroke_timing: starting: interval ~20ms
debug3: obfuscate_keystroke_timing: stopping: chaff time expired (0 chaff packets sent)
debug3: obfuscate_keystroke_timing: starting: interval ~20ms
Read from remote host 142.132.201.35: Connection reset by peer
Connection to 142.132.201.35 closed.
debug3: send packet: type 1
client_loop: send disconnect: Broken pipe


-- 
      Dr. Helge Kreutzmann                     [email protected]
           Dipl.-Phys.                   http://www.helgefjell.de/debian.php
        64bit GNU powered                     gpg signed mail preferred
           Help keep free software "libre": http://www.ffii.de/

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