$ ssh fox -vvv debug1: OpenSSH_10.1p1, OpenSSL 3.6.0 1 Oct 2025 debug3: Running on Linux 6.17.5 #1-NixOS SMP PREEMPT_DYNAMIC Thu Oct 23 14:24:41 UTC 2025 x86_64 debug3: Started with: ssh -o ControlMaster=no fox -vvv debug1: Reading configuration data /home/leix/.ssh/config debug3: /home/leix/.ssh/config line 1: Including file /home/leix/.ssh/config.d/bsc depth 0 debug1: Reading configuration data /home/leix/.ssh/config.d/bsc debug1: /home/leix/.ssh/config.d/bsc line 71: Applying options for fox debug1: /home/leix/.ssh/config line 4: Applying options for * debug1: Reading configuration data /etc/ssh/ssh_config debug3: /etc/ssh/ssh_config line 1: Including file /nix/store/8p6dgm9qkirma58mk402n642l8qnswdh-libvirt-11.7.0/etc/ssh/ssh_config.d/30-libvirt-ssh-proxy.conf depth 0 debug1: Reading configuration data /nix/store/8p6dgm9qkirma58mk402n642l8qnswdh-libvirt-11.7.0/etc/ssh/ssh_config.d/30-libvirt-ssh-proxy.conf debug1: /etc/ssh/ssh_config line 4: Applying options for * debug3: /etc/ssh/ssh_config line 7: Including file /nix/store/f8plklbbq3gwkq1wfq89i3f4wy8rabzn-systemd-258/lib/systemd/ssh_config.d/20-systemd-ssh-proxy.conf depth 0 debug1: Reading configuration data /nix/store/f8plklbbq3gwkq1wfq89i3f4wy8rabzn-systemd-258/lib/systemd/ssh_config.d/20-systemd-ssh-proxy.conf debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/home/leix/.ssh/known_hosts' debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/home/leix/.ssh/known_hosts2' debug2: resolving "fox.ac.upc.edu" port 22 debug3: resolve_host: lookup fox.ac.upc.edu:22 debug3: channel_clear_timeouts: clearing debug3: ssh_connect_direct: entering debug1: Connecting to fox.ac.upc.edu [147.83.30.141] port 22. debug3: set_sock_tos: set socket 3 IP_TOS 0xb8 debug1: Connection established. debug1: no pubkey loaded from /home/leix/.ssh/id_rsa debug1: identity file /home/leix/.ssh/id_rsa type -1 debug1: no identity pubkey loaded from /home/leix/.ssh/id_rsa debug1: no pubkey loaded from /home/leix/.ssh/id_ecdsa debug1: identity file /home/leix/.ssh/id_ecdsa type -1 debug1: no identity pubkey loaded from /home/leix/.ssh/id_ecdsa debug1: no pubkey loaded from /home/leix/.ssh/id_ecdsa_sk debug1: identity file /home/leix/.ssh/id_ecdsa_sk type -1 debug1: no identity pubkey loaded from /home/leix/.ssh/id_ecdsa_sk debug1: loaded pubkey from /home/leix/.ssh/id_ed25519: ED25519 SHA256:Jmq7aNH8XDdGy7E9dqfqrc/LRaVqhnFgDgdxlFw/pl8 debug1: identity file /home/leix/.ssh/id_ed25519 type 2 debug1: no identity pubkey loaded from /home/leix/.ssh/id_ed25519 debug1: no pubkey loaded from /home/leix/.ssh/id_ed25519_sk debug1: identity file /home/leix/.ssh/id_ed25519_sk type -1 debug1: no identity pubkey loaded from /home/leix/.ssh/id_ed25519_sk debug1: Local version string SSH-2.0-OpenSSH_10.1 debug1: Remote protocol version 2.0, remote software version OpenSSH_10.0 debug1: compat_banner: match: OpenSSH_10.0 pat OpenSSH* compat 0x04000000 debug2: fd 3 setting O_NONBLOCK debug1: Authenticating to fox.ac.upc.edu:22 as 'abonerib' debug3: record_hostkey: found key type ED25519 in file /home/leix/.ssh/known_hosts:87 debug3: load_hostkeys_file: loaded 1 keys from fox.ac.upc.edu debug1: load_hostkeys: fopen /home/leix/.ssh/known_hosts2: No such file or directory debug3: order_hostkeyalgs: have matching best-preference key type ssh-ed25519-cert-v01@openssh.com, using HostkeyAlgorithms verbatim 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: mlkem768x25519-sha256,sntrup761x25519-sha512,sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.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,ext-info-c,kex-strict-c-v00@openssh.com debug2: host key algorithms: ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256 debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,zlib@openssh.com debug2: compression stoc: none,zlib@openssh.com debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug2: peer server KEXINIT proposal debug2: KEX algorithms: mlkem768x25519-sha256,sntrup761x25519-sha512,sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org,diffie-hellman-group-exchange-sha256,ext-info-s,kex-strict-s-v00@openssh.com debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-ed25519 debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr debug2: MACs ctos: hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com debug2: MACs stoc: hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,umac-128-etm@openssh.com debug2: compression ctos: none,zlib@openssh.com debug2: compression stoc: none,zlib@openssh.com 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: mlkem768x25519-sha256 debug1: kex: host key algorithm: ssh-ed25519 debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: compression: none debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: 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:cDBabPuvPOssSIjnjQ1Inho8Gk/5FwJSacS65mPuG10 debug3: record_hostkey: found key type ED25519 in file /home/leix/.ssh/known_hosts:87 debug3: load_hostkeys_file: loaded 1 keys from fox.ac.upc.edu debug1: load_hostkeys: fopen /home/leix/.ssh/known_hosts2: No such file or directory debug1: Host 'fox.ac.upc.edu' is known and matches the ED25519 host key. debug1: Found key in /home/leix/.ssh/known_hosts:87 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: Sending SSH2_MSG_EXT_INFO debug3: send packet: type 7 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: mlkem768x25519-sha256,sntrup761x25519-sha512,sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.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,ext-info-c,kex-strict-c-v00@openssh.com debug2: host key algorithms: ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256 debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,zlib@openssh.com debug2: compression stoc: none,zlib@openssh.com 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= debug3: kex_input_ext_info: extension publickey-hostbound@openssh.com debug1: kex_ext_info_check_ver: publickey-hostbound@openssh.com=<0> debug3: kex_input_ext_info: extension ping@openssh.com debug1: kex_ext_info_check_ver: ping@openssh.com=<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 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= 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 debug3: ssh_get_authentication_socket_path: path '/run/user/1000/gnupg/d.4so5ppczz6q7szsowwgqfpei/S.gpg-agent.ssh' debug2: get_agent_identities: ssh_agent_bind_hostkey: agent refused operation debug1: get_agent_identities: agent returned 1 keys debug1: Will attempt key: /home/leix/.ssh/id_ed25519 ED25519 SHA256:Jmq7aNH8XDdGy7E9dqfqrc/LRaVqhnFgDgdxlFw/pl8 agent debug1: Will attempt key: /home/leix/.ssh/id_rsa debug1: Will attempt key: /home/leix/.ssh/id_ecdsa debug1: Will attempt key: /home/leix/.ssh/id_ecdsa_sk debug1: Will attempt key: /home/leix/.ssh/id_ed25519_sk debug2: pubkey_prepare: done debug1: Offering public key: /home/leix/.ssh/id_ed25519 ED25519 SHA256:Jmq7aNH8XDdGy7E9dqfqrc/LRaVqhnFgDgdxlFw/pl8 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/leix/.ssh/id_ed25519 ED25519 SHA256:Jmq7aNH8XDdGy7E9dqfqrc/LRaVqhnFgDgdxlFw/pl8 agent debug3: sign_and_send_pubkey: using publickey-hostbound-v00@openssh.com with ED25519 SHA256:Jmq7aNH8XDdGy7E9dqfqrc/LRaVqhnFgDgdxlFw/pl8 debug3: sign_and_send_pubkey: signing using ssh-ed25519 SHA256:Jmq7aNH8XDdGy7E9dqfqrc/LRaVqhnFgDgdxlFw/pl8 debug3: send packet: type 50 Connection closed by 147.83.30.141 port 22