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I know this topic has already been discussed and I have tried every solutions provided but still I am unable to connect to target device running Angstrom.

I need to send few files so I am running below command on my Ubuntu 16.04:

scp file.txt root@172.40.5.50:/home/root/

But I am getting below error:

packet_write wait Connection to 172.40.5.50 Port: 22 Broken Pipe

I then tried ssh root@172.40.5.50 but still the same error. I have also tried including ClientAliveInterval & ServerAliveInterval but no results. Earlier I though there is some problem with the image of Angstrom I am using. So to test it I installed putty on ubuntu and did the same SSH, entered the ip address 172.40.5.50 and it was successfull. So I am sure there is some problem on my ubuntu. Does anyone know how to rectify this error. Please help. Thanks.

Edit: Response of the command ssh -vvv root@172.40.5.50

OpenSSH_7.2p2 Ubuntu-4ubuntu2.1, OpenSSL 1.0.2g  1 Mar 2016

debug1: Reading configuration data /etc/ssh/ssh_config

debug1: /etc/ssh/ssh_config line 19: Applying options for *

debug2: resolving "172.40.5.50" port 22

debug2: ssh_connect_direct: needpriv 0

debug1: Connecting to 172.40.5.50 [172.40.5.50] port 22.

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_7.2p2 Ubuntu-4ubuntu2.1

debug1: Remote protocol version 2.0, remote software version OpenSSH_6.7

debug1: match: OpenSSH_6.7 pat OpenSSH* compat 0x04000000

debug2: fd 3 setting O_NONBLOCK

debug1: Authenticating to 172.40.5.50:22 as 'root'

debug3: hostkeys_foreach: reading file "/root/.ssh/known_hosts"

debug3: record_hostkey: found key type ECDSA in file /root/.ssh/known_hosts:5

debug3: load_hostkeys: loaded 1 keys from 172.40.5.50

debug3: order_hostkeyalgs: prefer hostkeyalgs: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.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@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,ext-info-c

debug2: host key algorithms: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa

debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc

debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc

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,zlib

debug2: compression stoc: none,zlib@openssh.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@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1

debug2: host key algorithms: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ssh-ed25519

debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com

debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com

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

debug2: compression stoc: none

debug2: languages ctos: 

debug2: languages stoc: 

debug2: first_kex_follows 0 

debug2: reserved 0 

debug1: kex: algorithm: curve25519-sha256@libssh.org

debug1: kex: host key algorithm: ecdsa-sha2-nistp256

debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none

debug1: kex: client->server cipher: chacha20-poly1305@openssh.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 SHA256:5Tcw4TxVzgxkH95GT6kXtr8YVX0rXlod1bQbNZw8boc

debug3: hostkeys_foreach: reading file "/root/.ssh/known_hosts"

debug3: record_hostkey: found key type ECDSA in file /root/.ssh/known_hosts:5

debug3: load_hostkeys: loaded 1 keys from 172.40.5.50

debug1: Host '172.40.5.50' is known and matches the ECDSA host key.

debug1: Found key in /root/.ssh/known_hosts:5

debug3: send packet: type 21

debug2: set_newkeys: mode 1

 debug1: rekey after 134217728 blocks

debug1: SSH2_MSG_NEWKEYS sent

debug1: expecting SSH2_MSG_NEWKEYS

debug3: receive packet: type 21

debug2: set_newkeys: mode 0

debug1: rekey after 134217728 blocks

debug1: SSH2_MSG_NEWKEYS received

debug2: key: /root/.ssh/id_rsa ((nil))

debug2: key: /root/.ssh/id_dsa ((nil))

debug2: key: /root/.ssh/id_ecdsa ((nil))

debug2: key: /root/.ssh/id_ed25519 ((nil))

debug3: send packet: type 5

debug1: Authentication succeeded (none).

debug1: getpeername failed: Transport endpoint is not connected

Authenticated to 172.40.5.50 ([UNKNOWN]:-1).

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 no-more-sessions@openssh.com

debug3: send packet: type 80

debug1: Entering interactive session.

debug1: pledge: network

debug3: send packet: type 1

packet_write_wait: Connection to 172.40.5.50 port 22: Broken pipe`

For reference after "debug1: Entering interactive session." on linux centos10 -> fedora or centos for a successful ssh session this is what is seen using ssh -vvv:

debug1: Entering interactive session.

debug2: callback start

debug2: fd 3 setting TCP_NODELAY

debug3: packet_set_tos: set IP_TOS 0x10

debug2: client_session2_setup: id 0

debug2: channel 0: request pty-req confirm 1

debug1: Sending environment.

debug3: Ignored env XDG_SESSION_ID

debug3: Ignored env HOSTNAME

debug3: Ignored env TERM

debug3: Ignored env SHELL

debug3: Ignored env HISTSIZE

debug3: Ignored env SSH_CLIENT

debug3: Ignored env SSH_TTY

debug3: Ignored env USER

debug3: Ignored env LS_COLORS

debug3: Ignored env STAGING

debug3: Ignored env MAIL

debug3: Ignored env PATH

debug3: Ignored env VIP

debug3: Ignored env PWD

debug1: Sending env XMODIFIERS = @im=none

debug2: channel 0: request env confirm 0

debug1: Sending env LANG = en_GB.UTF-8

debug2: channel 0: request env confirm 0

debug3: Ignored env HISTCONTROL

debug3: Ignored env SHLVL

debug3: Ignored env HOME

debug3: Ignored env LOGNAME

debug3: Ignored env SSH_CONNECTION

debug3: Ignored env LESSOPEN

debug3: Ignored env XDG_RUNTIME_DIR

debug3: Ignored env SUT_OTHER

debug3: Ignored env _

debug2: channel 0: request shell confirm 1

debug2: callback done

debug2: channel 0: open confirm rwindow 0 rmax 32768

debug2: channel_input_status_confirm: type 99 id 0

debug2: PTY allocation request accepted on channel 0

debug2: channel 0: rcvd adjust 2097152

debug2: channel_input_status_confirm: type 99 id 0

debug2: shell request accepted on channel 0

What does "debug1: pledge: network" mean?
Is there a pause in debug output after that message ?
Looks like the same problem as here which is not quite resolved but has several ssh config changes and system service restarts suggested which may resolve:

https://serverfault.com/questions/792486/ssh-connection-takes-forever-to-initiate-stuck-at-pledge-network