Output from FreeBSD 12.0-ALPHA7 r338849 amd64: scp -v -P 32 joga@172.16.0.1:100Mb . Executing: program /usr/bin/ssh host 172.16.0.1, user joga, command scp -v -f 100Mb OpenSSH_7.8p1, OpenSSL 1.0.2p-freebsd 14 Aug 2018 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Connecting to 172.16.0.1 [172.16.0.1] port 32. debug1: Connection established. debug1: identity file /home/joga/.ssh/id_rsa type -1 debug1: identity file /home/joga/.ssh/id_rsa-cert type -1 debug1: identity file /home/joga/.ssh/id_dsa type -1 debug1: identity file /home/joga/.ssh/id_dsa-cert type -1 debug1: identity file /home/joga/.ssh/id_ecdsa type -1 debug1: identity file /home/joga/.ssh/id_ecdsa-cert type -1 debug1: identity file /home/joga/.ssh/id_ed25519 type -1 debug1: identity file /home/joga/.ssh/id_ed25519-cert type -1 debug1: identity file /home/joga/.ssh/id_xmss type -1 debug1: identity file /home/joga/.ssh/id_xmss-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_7.8 FreeBSD-20180909 debug1: Remote protocol version 2.0, remote software version OpenSSH_7.8 debug1: match: OpenSSH_7.8 pat OpenSSH* compat 0x04000000 debug1: Authenticating to 172.16.0.1:32 as 'joga' debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: algorithm: curve25519-sha256 debug1: kex: host key algorithm: ecdsa-sha2-nistp256 debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: compression: none debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: compression: none debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: Server host key: ecdsa-sha2-nistp256 SHA256:gdn21NUmzMhZlVtr+/rKDhnUP1bbPibBQy3bAckzCSA debug1: skipped DNS lookup for numerical hostname debug1: Host '[172.16.0.1]:32' is known and matches the ECDSA host key. debug1: Found key in /home/joga/.ssh/known_hosts:2 debug1: rekey after 134217728 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: rekey after 134217728 blocks debug1: SSH2_MSG_EXT_INFO received debug1: Fssh_kex_input_ext_info: server-sig-algs= debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /home/joga/.ssh/id_rsa debug1: Trying private key: /home/joga/.ssh/id_dsa debug1: Trying private key: /home/joga/.ssh/id_ecdsa debug1: Trying private key: /home/joga/.ssh/id_ed25519 debug1: Trying private key: /home/joga/.ssh/id_xmss debug1: Next authentication method: password joga@172.16.0.1's password: debug1: Authentication succeeded (password). Authenticated to 172.16.0.1 ([172.16.0.1]:32). debug1: channel 0: new [client-session] debug1: Requesting no-more-sessions@openssh.com debug1: Entering interactive session. debug1: pledge: network debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0 debug1: Sending command: scp -v -f 100Mb Sending file modes: C0644 104857600 100Mb Sink: C0644 104857600 100Mb 100Mb 55% 56MB 0.0KB/s - stalled -^Cdebug1: channel 0: free: client-session, nchannels 1 debug1: fd 0 clearing O_NONBLOCK Killed by signal 2. # I pressed ctrl-c Output from GNU/Linux on same computer/wifi: scp -v -P 32 joga@172.16.0.1:100Mb . Executing: program /usr/bin/ssh host 172.16.0.1, user joga, command scp -v -f 100Mb OpenSSH_7.4p1 Debian-10+deb9u4, OpenSSL 1.0.2l 25 May 2017 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 1: Applying options for 172.16.* debug1: /etc/ssh/ssh_config line 4: Applying options for * debug1: Connecting to 172.16.0.1 [172.16.0.1] port 32. debug1: Connection established. debug1: permanently_set_uid: 0/0 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_rsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_rsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_dsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_dsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_ecdsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_ecdsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_ed25519 type -1 debug1: key_load_public: No such file or directory debug1: identity file /root/.ssh/id_ed25519-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u4 debug1: Remote protocol version 2.0, remote software version OpenSSH_7.8 debug1: match: OpenSSH_7.8 pat OpenSSH* compat 0x04000000 debug1: Authenticating to 172.16.0.1:32 as 'joga' debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: algorithm: curve25519-sha256 debug1: kex: host key algorithm: ecdsa-sha2-nistp256 debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: compression: zlib@openssh.com debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: compression: zlib@openssh.com debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: Server host key: ecdsa-sha2-nistp256 SHA256:gdn21NUmzMhZlVtr+/rKDhnUP1bbPibBQy3bAckzCSA debug1: Host '[172.16.0.1]:32' is known and matches the ECDSA host key. debug1: Found key in /root/.ssh/known_hosts:1 debug1: rekey after 134217728 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: rekey after 134217728 blocks debug1: SSH2_MSG_EXT_INFO received debug1: kex_input_ext_info: server-sig-algs= debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /root/.ssh/id_rsa debug1: Trying private key: /root/.ssh/id_dsa debug1: Trying private key: /root/.ssh/id_ecdsa debug1: Trying private key: /root/.ssh/id_ed25519 debug1: Next authentication method: password joga@172.16.0.1's password: debug1: Enabling compression at level 6. debug1: Authentication succeeded (password). Authenticated to 172.16.0.1 ([172.16.0.1]:32). debug1: channel 0: new [client-session] debug1: Requesting no-more-sessions@openssh.com debug1: Entering interactive session. debug1: pledge: network debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0 debug1: Sending command: scp -v -f 100Mb Sending file modes: C0644 104857600 100Mb Sink: C0644 104857600 100Mb 100Mb 100% 100MB 5.6MB/s 00:17 debug1: client_input_channel_req: channel 0 rtype exit-status reply 0 debug1: client_input_channel_req: channel 0 rtype eow@openssh.com reply 0 debug1: channel 0: free: client-session, nchannels 1 debug1: fd 0 clearing O_NONBLOCK debug1: fd 1 clearing O_NONBLOCK Transferred: sent 20008, received 105033008 bytes, in 17.9 seconds Bytes per second: sent 1114.9, received 5852676.4 debug1: Exit status 0 debug1: compress outgoing: raw data 8286, compressed 3983, factor 0.48 debug1: compress incoming: raw data 104913099, compressed 104951250, factor 1.00