for a while I have been having issues with ssh on my macbook (Big Sur). I first noticed with git. Now I am trying to connect to a VM and after I enter my password the terminal freezes for a while and then I get: client_loop: send disconnect: Broken pipe. I have tried adding ServerAliveInterval, IPQoS and other solutions I found, but nothing seems to work.
Host * SendEnv LANG LC_* ServerAliveInterval 120 IPQoS lowdelay throughput ServerAliveCountMax 5 This is the verbose output:
ssh -vvv mmm@server OpenSSH_8.1p1, LibreSSL 2.7.3 debug1: Reading configuration data /Users/mmm/.ssh/config debug1: /Users/mmm/.ssh/config line 1: Applying options for * debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 47: Applying options for * debug1: Connecting to server port 22. debug1: Connection established. debug1: identity file /Users/mmm/.ssh/id_rsa type 0 debug1: identity file /Users/mmm/.ssh/id_rsa-cert type -1 debug1: identity file /Users/mmm/.ssh/id_dsa type -1 debug1: identity file /Users/mmm/.ssh/id_dsa-cert type -1 debug1: identity file /Users/mmm/.ssh/id_ecdsa type -1 debug1: identity file /Users/mmm/.ssh/id_ecdsa-cert type -1 debug1: identity file /Users/mmm/.ssh/id_ed25519 type -1 debug1: identity file /Users/mmm/.ssh/id_ed25519-cert type -1 debug1: identity file /Users/mmm/.ssh/id_xmss type -1 debug1: identity file /Users/mmm/.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_7.9p1 Debian-10+deb10u2 debug1: match: OpenSSH_7.9p1 Debian-10+deb10u2 pat OpenSSH* compat 0x04000000 debug3: fd 5 is O_NONBLOCK debug1: Authenticating to server:22 as 'mmm' debug3: hostkeys_foreach: reading file "/Users/mmm/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file /Users/mmm/.ssh/known_hosts:6 debug3: load_hostkeys: loaded 1 keys from server debug3: order_hostkeyalgs: prefer hostkeyalgs: ,,,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,,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,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,,,,,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa debug2: ciphers ctos: ,aes128-ctr,aes192-ctr,aes256-ctr,, debug2: ciphers stoc: ,aes128-ctr,aes192-ctr,aes256-ctr,, debug2: MACs ctos: ,,,,,,,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: ,,,,,,,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,,zlib debug2: compression stoc: none,,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,,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 debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-rsa,ecdsa-sha2-nistp256,ssh-ed25519 debug2: ciphers ctos: ,aes128-ctr,aes192-ctr,aes256-ctr,, debug2: ciphers stoc: ,aes128-ctr,aes192-ctr,aes256-ctr,, debug2: MACs ctos: ,,,,,,,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: ,,,,,,,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none, debug2: compression stoc: none, 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: MAC: <implicit> compression: none debug1: kex: client->server cipher: 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:Gy6pf90yIod/x4QkXV3gIa1u0W8DuNRnsLHNe+JWzU debug3: hostkeys_foreach: reading file "/Users/mmm/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file /Users/mmm/.ssh/known_hosts:6 debug3: load_hostkeys: loaded 1 keys from server debug3: hostkeys_foreach: reading file "/Users/mmm/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file /Users/mmm/.ssh/known_hosts:6 debug3: load_hostkeys: loaded 1 keys from IP debug1: Host 'server' is known and matches the ECDSA host key. debug1: Found key in /Users/mmm/.ssh/known_hosts:6 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/mmm/.ssh/id_rsa RSA SHA256:Bonpo3/yi3FnTjV2Md5en+iJzXYNcHsCwpnJyaVDLI debug1: Will attempt key: /Users/mmm/.ssh/id_dsa debug1: Will attempt key: /Users/mmm/.ssh/id_ecdsa debug1: Will attempt key: /Users/mmm/.ssh/id_ed25519 debug1: Will attempt key: /Users/mmm/.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,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521> 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 debug3: start over, passed a different list publickey 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/mmm/.ssh/id_rsa RSA SHA256:Bonpo3/yi3FnTjV2Md5en+iJzXYNcHsCwpnJyaVDLI debug3: send packet: type 50 debug2: we sent a publickey packet, wait for reply debug3: receive packet: type 60 debug1: Server accepts key: /Users/mmm/.ssh/id_rsa RSA SHA256:Bonpo3/yi3FnTjV2Md5en+iJzXYNcHsCwpnJyaVDLI debug3: sign_and_send_pubkey: RSA SHA256:Bonpo3/yi3FnTjV2Md5en+iJzXYNcHsCwpnJyaVDLI debug3: sign_and_send_pubkey: signing using rsa-sha2-512 Enter passphrase for key '/Users/mmm/.ssh/id_rsa': debug3: send packet: type 50 debug3: receive packet: type 52 debug1: Authentication succeeded (publickey). Authenticated to server ([IP]:22). debug1: channel 0: new [client-session] debug3: ssh_session2_open: channel_new: 0 debug2: channel 0: send open debug3: send packet: type 90 debug1: Requesting debug3: send packet: type 80 debug1: Entering interactive session. debug1: pledge: network debug3: receive packet: type 80 debug1: client_input_global_request: rtype want_reply 0 debug3: receive packet: type 4 debug1: Remote: /home/mmm/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding debug3: receive packet: type 4 debug1: Remote: /home/mmm/.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 5 setting TCP_NODELAY debug3: ssh_packet_set_tos: set IP_TOS 0x08 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 TERM_PROGRAM debug3: Ignored env TERM debug3: Ignored env SHELL debug3: Ignored env TMPDIR debug3: Ignored env TERM_PROGRAM_VERSION debug3: Ignored env TERM_SESSION_ID debug3: Ignored env USER debug3: Ignored env COMMAND_MODE debug3: Ignored env SSH_AUTH_SOCK debug3: Ignored env __CF_USER_TEXT_ENCODING debug3: Ignored env PATH debug3: Ignored env __CFBundleIdentifier debug3: Ignored env PWD debug3: Ignored env ITERM_PROFILE debug3: Ignored env XPC_FLAGS debug3: Ignored env XPC_SERVICE_NAME debug3: Ignored env SHLVL debug3: Ignored env HOME debug3: Ignored env COLORFGBG debug1: Sending env LC_TERMINAL_VERSION = 3.4.4 debug2: channel 0: request env confirm 0 debug3: send packet: type 98 debug3: Ignored env ITERM_SESSION_ID debug3: Ignored env LOGNAME debug1: Sending env LC_CTYPE = UTF-8 debug2: channel 0: request env confirm 0 debug3: send packet: type 98 debug1: Sending env LC_TERMINAL = iTerm2 debug2: channel 0: request env confirm 0 debug3: send packet: type 98 debug3: Ignored env COLORTERM debug3: Ignored env _ debug2: channel 0: request shell confirm 1 debug3: send packet: type 98 debug2: channel_input_open_confirmation: channel 0: callback done debug2: channel 0: open confirm rwindow 0 rmax 32768 debug3: send packet: type 80 debug3: send packet: type 1 client_loop: send disconnect: Broken pipe 1 Answer
I had the same problem on my MAC OS Catalina 10.15.5 After some research on google I added the following line to my /etc/ssh/ssh_config Host * IPQoS=throughput And it fixed the problem. Note that I initially tried to add the same in .ssh/config file (i had to create it) and apparently it is not working on MAC. Unlike any Linux distro. So use /etc/ssh/ssh_config on MAC to configure your SSH Client
3
