received ssh2_msg_channel_data for channel 256 with no outstanding channel request

[garyz-inspirum]

I'm using Rospo's internal sshd server, with the following configure, when connecting to the server from localhost using putty, it shows the following error received ssh2_msg_channel_data for channel 256 with no outstanding channel request, I also tried just using ssh client from the command prompt, also tried on another windows machine on the other network, it all seems to have the same error.

However, it can connect successfully from a ubuntu client. I wonder what is wrong here.

sshd:
server_key: "./keys/server_key"
authorized_password: tetstpassword
listen_address: ":56740"
disable_shell: false
disable_banner: true
disable_tunnelling: false
disable_auth: false
disable_sftp_subsystem: false
shell_executable: "C:\Installed\Cygwin\bin\bash.exe"

ssh -vvv log output

C:\Users>ssh -vvv user@localhost -p 56740
OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2
debug3: Failed to open file:C:/Users/username/.ssh/config error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_config error:2
debug2: resolving "localhost" port 56740
debug2: ssh_connect_direct
debug1: Connecting to localhost [::1] port 56740.
debug1: Connection established.
debug3: Failed to open file:C:/Users/username/.ssh/id_rsa error:2
debug3: Failed to open file:C:/Users/username/.ssh/id_rsa.pub error:2
debug1: identity file C:\Users\username/.ssh/id_rsa type -1
debug3: Failed to open file:C:/Users/username/.ssh/id_rsa-cert error:2
debug3: Failed to open file:C:/Users/username/.ssh/id_rsa-cert.pub error:2
debug1: identity file C:\Users\username/.ssh/id_rsa-cert type -1
debug3: Failed to open file:C:/Users/username/.ssh/id_dsa error:2
debug3: Failed to open file:C:/Users/username/.ssh/id_dsa.pub error:2
debug1: identity file C:\Users\username/.ssh/id_dsa type -1
debug3: Failed to open file:C:/Users/username/.ssh/id_dsa-cert error:2
debug3: Failed to open file:C:/Users/username/.ssh/id_dsa-cert.pub error:2
debug1: identity file C:\Users\username/.ssh/id_dsa-cert type -1
debug3: Failed to open file:C:/Users/username/.ssh/id_ecdsa error:2
debug3: Failed to open file:C:/Users/username/.ssh/id_ecdsa.pub error:2
debug1: identity file C:\Users\username/.ssh/id_ecdsa type -1
debug3: Failed to open file:C:/Users/username/.ssh/id_ecdsa-cert error:2
debug3: Failed to open file:C:/Users/username/.ssh/id_ecdsa-cert.pub error:2
debug1: identity file C:\Users\username/.ssh/id_ecdsa-cert type -1
debug3: Failed to open file:C:/Users/username/.ssh/id_ed25519 error:2
debug3: Failed to open file:C:/Users/username/.ssh/id_ed25519.pub error:2
debug1: identity file C:\Users\username/.ssh/id_ed25519 type -1
debug3: Failed to open file:C:/Users/username/.ssh/id_ed25519-cert error:2
debug3: Failed to open file:C:/Users/username/.ssh/id_ed25519-cert.pub error:2
debug1: identity file C:\Users\username/.ssh/id_ed25519-cert type -1
debug3: Failed to open file:C:/Users/username/.ssh/id_xmss error:2
debug3: Failed to open file:C:/Users/username/.ssh/id_xmss.pub error:2
debug1: identity file C:\Users\username/.ssh/id_xmss type -1
debug3: Failed to open file:C:/Users/username/.ssh/id_xmss-cert error:2
debug3: Failed to open file:C:/Users/username/.ssh/id_xmss-cert.pub error:2
debug1: identity file C:\Users\username/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_for_Windows_8.1
debug1: Remote protocol version 2.0, remote software version Go
debug1: no match: Go
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to localhost:56740 as 'user'
debug3: put_host_port: [localhost]:56740
debug3: hostkeys_foreach: reading file "C:\Users\username/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file C:\Users\username/.ssh/known_hosts:14
debug3: load_hostkeys: loaded 1 keys from [localhost]:56740
debug3: Failed to open file:C:/Users/username/.ssh/known_hosts2 error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2
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,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,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,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-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
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@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,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,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,kex-strict-s-v00@openssh.com
debug2: host key algorithms: ecdsa-sha2-nistp521
debug2: ciphers ctos: aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr
debug2: ciphers stoc: aes128-gcm@openssh.com,aes256-gcm@openssh.com,chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr
debug2: MACs ctos: hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1,hmac-sha1-96
debug2: MACs stoc: hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1,hmac-sha1-96
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-nistp521
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: Server host key: ecdsa-sha2-nistp521 SHA256:wmo1rArJt4RnZSKMCRhH41ixZIkgCIljUcO+7aiqlqo
debug3: put_host_port: [::1]:56740
debug3: put_host_port: [localhost]:56740
debug3: hostkeys_foreach: reading file "C:\Users\username/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file C:\Users\username/.ssh/known_hosts:14
debug3: load_hostkeys: loaded 1 keys from [localhost]:56740
debug3: Failed to open file:C:/Users/username/.ssh/known_hosts2 error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2
debug1: Host '[localhost]:56740' is known and matches the ECDSA host key.
debug1: Found key in C:\Users\username/.ssh/known_hosts:14
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
debug3: unable to connect to pipe \\.\pipe\openssh-ssh-agent, error: 2
debug1: pubkey_prepare: ssh_get_authentication_socket: No such file or directory
debug1: Will attempt key: C:\Users\username/.ssh/id_rsa
debug1: Will attempt key: C:\Users\username/.ssh/id_dsa
debug1: Will attempt key: C:\Users\username/.ssh/id_ecdsa
debug1: Will attempt key: C:\Users\username/.ssh/id_ed25519
debug1: Will attempt key: C:\Users\username/.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,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-256,rsa-sha2-512,ssh-rsa,ssh-dss>
debug1: kex_input_ext_info: ping@openssh.com (unrecognised)
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: password,publickey
debug3: start over, passed a different list password,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: Trying private key: C:\Users\username/.ssh/id_rsa
debug3: no such identity: C:\Users\username/.ssh/id_rsa: No such file or directory
debug1: Trying private key: C:\Users\username/.ssh/id_dsa
debug3: no such identity: C:\Users\username/.ssh/id_dsa: No such file or directory
debug1: Trying private key: C:\Users\username/.ssh/id_ecdsa
debug3: no such identity: C:\Users\username/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: C:\Users\username/.ssh/id_ed25519
debug3: no such identity: C:\Users\username/.ssh/id_ed25519: No such file or directory
debug1: Trying private key: C:\Users\username/.ssh/id_xmss
debug3: no such identity: C:\Users\username/.ssh/id_xmss: No such file or directory
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
debug3: failed to open file:C:/dev/tty error:3
debug1: read_passphrase: can't open /dev/tty: No such file or directory
user@localhost's password:
debug3: send packet: type 50
debug2: we sent a password packet, wait for reply
debug3: receive packet: type 52
debug1: Authentication succeeded (password).
Authenticated to localhost ([::1]:56740).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Entering interactive session.
debug1: pledge: network
debug1: ENABLE_VIRTUAL_TERMINAL_INPUT is supported. Reading the VTSequence from console
debug3: This windows OS supports conpty
debug1: ENABLE_VIRTUAL_TERMINAL_PROCESSING is supported. Console supports the ansi parsing
debug3: Successfully set console output code page from:65001 to 65001
debug3: Successfully set console input code page from:850 to 65001
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: fd 3 setting TCP_NODELAY
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
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 2097152 rmax 32768
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
debug3: receive packet: type 98
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug3: receive packet: type 98
debug1: client_input_channel_req: channel 0 rtype exit-signal reply 0
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98
debug2: client_check_window_change: changed
debug2: channel 0: request window-change confirm 0
debug3: send packet: type 98

nothing happens after this.