Linux SCP across 2 VMs with PORT and IP Forwarding in sshd_config file of VM1

Question

Aim : Do SCP across 2 VMs with PORT and IP Forwarding in sshd_config file of VM1. There are 2 servers serverX, serverY.
I would like to transfer a file from my windows machine to remote machine(serverY). But I can't reach serverY directly, hence I am routed via serverX.

Here's how the configuration of serverX portX's /etc/ssh/sshd_config looks

Match user arunch3x
 AllowStreamLocalForwarding yes
 AllowAgentForwarding yes
 AllowTcpForwarding yes
 GatewayPorts yes
 X11Forwarding yes
 PasswordAuthentication yes
 AllowTCPForwarding yes
 ForceCommand ssh arunch3x@serverY -p portY

When I do ssh to serverX portX, I am automatically routed to serverY portY. SSH is fine. But When I do SCP to serverX portX, its not getting completed, it goes into hang-mode.

Expectation: When I do SCP to serverX portX, it must automatically route to serverY portY as per the configurations and file must land in to serverY portY

Please refer to this SCP command that I am running from Windows machine.

scp -P portX tests.json arunch3x@serverX:/tmp/tests.json

As per the above command file tests.json must land in serverY portY directory /tmp as /tmp/tests/json

Error :

  After executing above command it goes into hang mode.

scp -P 30600 tests.json [email protected]:/tmp/tests.json

scp -P 30600 tests.json arunch3x@serverY:/tmp/tests.json
Pseudo-terminal will not be allocated because stdin is not a terminal.
OpenSSH_8.2p1 Ubuntu-4ubuntu0.4, OpenSSL 1.1.1f  31 Mar 2020
debug1: Reading configuration data /home/arunch3x/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug2: resolve_canonicalize: hostname serverY is address
debug2: ssh_connect_direct
debug1: Connecting to serverY [serverY] port portY.
debug1: Connection established.
debug1: identity file /home/arunch3x/.ssh/id_rsa type 0
debug1: identity file /home/arunch3x/.ssh/id_rsa-cert type -1
debug1: identity file /home/arunch3x/.ssh/id_dsa type -1
debug1: identity file /home/arunch3x/.ssh/id_dsa-cert type -1
debug1: identity file /home/arunch3x/.ssh/id_ecdsa type -1
debug1: identity file /home/arunch3x/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/arunch3x/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/arunch3x/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/arunch3x/.ssh/id_ed25519 type -1
debug1: identity file /home/arunch3x/.ssh/id_ed25519-cert type -1
debug1: identity file /home/arunch3x/.ssh/id_ed25519_sk type -1
debug1: identity file /home/arunch3x/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/arunch3x/.ssh/id_xmss type -1
debug1: identity file /home/arunch3x/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.4
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.2p1 Ubuntu-4ubuntu0.4
debug1: match: OpenSSH_8.2p1 Ubuntu-4ubuntu0.4 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to serverY:portY as 'arunch3x'
debug3: put_host_port: [serverY]:portY
debug3: hostkeys_foreach: reading file "/home/arunch3x/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/arunch3x/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from [serverY]:portY
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],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,[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
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ssh-ed25519,[email protected],rsa-sha2-512,rsa-sha2-256,ssh-rsa
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],zlib
debug2: compression stoc: none,[email protected],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,[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
debug2: host key algorithms: rsa-sha2-512,rsa-sha2-256,ssh-rsa,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
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
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: Server host key: ecdsa-sha2-nistp256 SHA256:W6y6gFSbfWwMcRWvyhJVCdwYeEy0NlEMpFtcn2lvitA
debug3: put_host_port: [serverY]:portY
debug3: put_host_port: [serverY]:portY
debug3: hostkeys_foreach: reading file "/home/arunch3x/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/arunch3x/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from [serverY]:portY
debug3: hostkeys_foreach: reading file "/home/arunch3x/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/arunch3x/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from [serverY]:portY
debug1: Host '[serverY]:portY' is known and matches the ECDSA host key.
debug1: Found key in /home/arunch3x/.ssh/known_hosts:1
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: /home/arunch3x/.ssh/id_rsa RSA SHA256:0TeS5DDHX3zEccKYK6uMjpwcNPm+gW5l29fzH5rb4cA
debug1: Will attempt key: /home/arunch3x/.ssh/id_dsa
debug1: Will attempt key: /home/arunch3x/.ssh/id_ecdsa
debug1: Will attempt key: /home/arunch3x/.ssh/id_ecdsa_sk
debug1: Will attempt key: /home/arunch3x/.ssh/id_ed25519
debug1: Will attempt key: /home/arunch3x/.ssh/id_ed25519_sk
debug1: Will attempt key: /home/arunch3x/.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,[email protected],ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected]>
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
debug1: Offering public key: /home/arunch3x/.ssh/id_rsa RSA SHA256:0TeS5DDHX3zEccKYK6uMjpwcNPm+gW5l29fzH5rb4cA
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: /home/arunch3x/.ssh/id_rsa RSA SHA256:0TeS5DDHX3zEccKYK6uMjpwcNPm+gW5l29fzH5rb4cA
debug3: sign_and_send_pubkey: RSA SHA256:0TeS5DDHX3zEccKYK6uMjpwcNPm+gW5l29fzH5rb4cA
debug3: sign_and_send_pubkey: signing using rsa-sha2-512 SHA256:0TeS5DDHX3zEccKYK6uMjpwcNPm+gW5l29fzH5rb4cA
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to serverY ([serverY]:portY).
debug3: ssh_init_stdio_forwarding: serverY:portY
debug1: channel_connect_stdio_fwd serverY:portY
debug1: channel 0: new [stdio-forward]
debug2: fd 4 setting O_NONBLOCK
debug2: fd 5 setting O_NONBLOCK
debug1: getpeername failed: Bad file descriptor
debug3: send packet: type 90
debug2: fd 3 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x10
debug1: Requesting [email protected]
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 80
debug1: client_input_global_request: rtype [email protected] want_reply 0
debug3: receive packet: type 4
debug1: Remote: /home/arunch3x/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
debug3: receive packet: type 4
debug1: Remote: /home/arunch3x/.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: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 2097152 rmax 32768
Welcome to Ubuntu 20.04.2 LTS (GNU/Linux 5.4.0-104-generic x86_64)
PS C:\Users\arunch3x\OneDrive - Intel Corporation\Documents\tests> debug3: send packet: type 1
debug1: channel 0: free: direct-tcpip: listening port 0 for serverY port portY, connect from 127.0.0.1 port 65535 to UNKNOWN port 65536, nchannels 1
debug3: channel 0: status: The following connections are open:
  #0 direct-tcpip: listening port 0 for serverY port portY, connect from 127.0.0.1 port 65535 to UNKNOWN port 65536 (t4 r0 i0/0 o0/0 e[closed]/0 fd 4/5/-1 sock -1 cc -1)

debug1: fd 0 clearing O_NONBLOCK
debug3: fd 1 is not O_NONBLOCK
debug3: fd 2 is not O_NONBLOCK
Killed by signal 1.

Command line just hangs on showing above error.

Can someone please share some inputs.