Issues with cisco Device

Hi Yang,

I have issues with my new device:

here is log debug:

ASA Local

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Equivalent Command: ssh -vvv -o HostKeyAlgorithms=+ssh-rsa -o KexAlgorithms=+diffie-hellman-group14-sha1 -o ServerAliveCountMax=3 -o ServerAliveInterval=15 -o ExitOnForwardFailure=yes -p 22 jaraujo@172.15.20.1

01:19:09 Connecting…

01:19:09 Using Core Helper 6.6 (r3386)

01:19:09 OpenSSH_8.8p1, OpenSSL 1.1.1l 24 Aug 2021

01:19:09 debug1: Reading configuration data /Users/skyones/.ssh/config

01:19:09 debug1: Reading configuration data /etc/ssh/ssh_config

01:19:09 debug1: /etc/ssh/ssh_config line 21: include /etc/ssh/ssh_config.d/* matched no files

01:19:09 debug1: /etc/ssh/ssh_config line 54: Applying options for *

01:19:09 debug2: resolve_canonicalize: hostname 172.15.20.1 is address

01:19:09 debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/Users/skyones/.ssh/known_hosts'

01:19:09 debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/Users/skyones/.ssh/known_hosts2'

01:19:09 debug3: ssh_connect_direct: entering

01:19:09 debug1: Connecting to 172.15.20.1 [172.15.20.1] port 22.

01:19:09 debug3: set_sock_tos: set socket 3 IP_TOS 0x48

01:19:09 debug1: Connection established.

01:19:09 debug1: identity file /Users/skyones/.ssh/id_rsa type -1

01:19:09 debug1: identity file /Users/skyones/.ssh/id_rsa-cert type -1

01:19:09 debug1: identity file /Users/skyones/.ssh/id_dsa type -1

01:19:09 debug1: identity file /Users/skyones/.ssh/id_dsa-cert type -1

01:19:09 debug1: identity file /Users/skyones/.ssh/id_ecdsa type -1

01:19:09 debug1: identity file /Users/skyones/.ssh/id_ecdsa-cert type -1

01:19:09 debug1: identity file /Users/skyones/.ssh/id_ecdsa_sk type -1

01:19:09 debug1: identity file /Users/skyones/.ssh/id_ecdsa_sk-cert type -1

01:19:09 debug1: identity file /Users/skyones/.ssh/id_ed25519 type -1

01:19:09 debug1: identity file /Users/skyones/.ssh/id_ed25519-cert type -1

01:19:09 debug1: identity file /Users/skyones/.ssh/id_ed25519_sk type -1

01:19:09 debug1: identity file /Users/skyones/.ssh/id_ed25519_sk-cert type -1

01:19:09 debug1: identity file /Users/skyones/.ssh/id_xmss type -1

01:19:09 debug1: identity file /Users/skyones/.ssh/id_xmss-cert type -1

01:19:09 debug1: Local version string SSH-2.0-OpenSSH_8.8

01:19:09 debug1: Remote protocol version 2.0, remote software version Cisco-1.25

01:19:09 debug1: compat_banner: match: Cisco-1.25 pat Cisco-1.* compat 0x60000000

01:19:09 debug2: fd 3 setting O_NONBLOCK

01:19:09 debug1: Authenticating to 172.15.20.1:22 as 'jaraujo'

01:19:09 debug1: load_hostkeys: fopen /Users/skyones/.ssh/known_hosts2: No such file or directory

01:19:09 debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory

01:19:09 debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory

01:19:09 debug3: order_hostkeyalgs: no algorithms matched; accept original

01:19:09 debug3: send packet: type 20

01:19:09 debug1: SSH2_MSG_KEXINIT sent

01:19:09 debug3: receive packet: type 20

01:19:09 debug1: SSH2_MSG_KEXINIT received

01:19:09 debug2: local client KEXINIT proposal

01:19:09 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

01:19:09 debug2: host key algorithms: ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa

01:19:09 debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com

01:19:09 debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com

01:19:09 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

01:19:09 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

01:19:09 debug2: compression ctos: none,zlib@openssh.com,zlib

01:19:09 debug2: compression stoc: none,zlib@openssh.com,zlib

01:19:09 debug2: languages ctos:

01:19:09 debug2: languages stoc:

01:19:09 debug2: first_kex_follows 0

01:19:09 debug2: reserved 0

01:19:09 debug2: peer server KEXINIT proposal

01:19:09 debug2: KEX algorithms: diffie-hellman-group14-sha256

01:19:09 debug2: host key algorithms:

01:19:09 debug2: ciphers ctos: aes128-gcm@openssh.com,aes256-ctr,aes256-cbc,aes192-ctr,aes192-cbc,aes128-ctr,aes128-cbc,chacha20-poly1305@openssh.com

01:19:09 debug2: ciphers stoc: aes128-gcm@openssh.com,aes256-ctr,aes256-cbc,aes192-ctr,aes192-cbc,aes128-ctr,aes128-cbc,chacha20-poly1305@openssh.com

01:19:09 debug2: MACs ctos: hmac-sha2-256

01:19:09 debug2: MACs stoc: hmac-sha2-256

01:19:09 debug2: compression ctos: none

01:19:09 debug2: compression stoc: none

01:19:09 debug2: languages ctos:

01:19:09 debug2: languages stoc:

01:19:09 debug2: first_kex_follows 0

01:19:09 debug2: reserved 0

01:19:09 debug1: kex: algorithm: diffie-hellman-group14-sha256

01:19:09 debug1: kex: host key algorithm: (no match)

01:19:09 Unable to negotiate with 172.15.20.1 port 22: no matching host key type found. Their offer:

01:19:09 Authenticating…

01:19:09 Abnormal Disconnect

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Equivalent Command: ssh -vvv -o HostKeyAlgorithms=+ssh-rsa -o KexAlgorithms=+diffie-hellman-group14-sha1 -o ServerAliveCountMax=3 -o ServerAliveInterval=15 -o ExitOnForwardFailure=yes -p 22 jaraujo@172.15.20.1

01:21:03 Connecting…

01:21:03 Using Core Helper 6.6 (r3386)

01:21:03 OpenSSH_8.8p1, OpenSSL 1.1.1l 24 Aug 2021

01:21:03 debug1: Reading configuration data /Users/skyones/.ssh/config

01:21:03 debug1: Reading configuration data /etc/ssh/ssh_config

01:21:03 debug1: /etc/ssh/ssh_config line 21: include /etc/ssh/ssh_config.d/* matched no files

01:21:03 debug1: /etc/ssh/ssh_config line 54: Applying options for *

01:21:03 debug2: resolve_canonicalize: hostname 172.15.20.1 is address

01:21:03 debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/Users/skyones/.ssh/known_hosts'

01:21:03 debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/Users/skyones/.ssh/known_hosts2'

01:21:03 debug3: ssh_connect_direct: entering

01:21:03 debug1: Connecting to 172.15.20.1 [172.15.20.1] port 22.

01:21:03 debug3: set_sock_tos: set socket 3 IP_TOS 0x48

01:21:03 debug1: Connection established.

01:21:03 debug1: identity file /Users/skyones/.ssh/id_rsa type -1

01:21:03 debug1: identity file /Users/skyones/.ssh/id_rsa-cert type -1

01:21:03 debug1: identity file /Users/skyones/.ssh/id_dsa type -1

01:21:03 debug1: identity file /Users/skyones/.ssh/id_dsa-cert type -1

01:21:03 debug1: identity file /Users/skyones/.ssh/id_ecdsa type -1

01:21:03 debug1: identity file /Users/skyones/.ssh/id_ecdsa-cert type -1

01:21:03 debug1: identity file /Users/skyones/.ssh/id_ecdsa_sk type -1

01:21:03 debug1: identity file /Users/skyones/.ssh/id_ecdsa_sk-cert type -1

01:21:03 debug1: identity file /Users/skyones/.ssh/id_ed25519 type -1

01:21:03 debug1: identity file /Users/skyones/.ssh/id_ed25519-cert type -1

01:21:03 debug1: identity file /Users/skyones/.ssh/id_ed25519_sk type -1

01:21:03 debug1: identity file /Users/skyones/.ssh/id_ed25519_sk-cert type -1

01:21:03 debug1: identity file /Users/skyones/.ssh/id_xmss type -1

01:21:03 debug1: identity file /Users/skyones/.ssh/id_xmss-cert type -1

01:21:03 debug1: Local version string SSH-2.0-OpenSSH_8.8

01:21:03 debug1: Remote protocol version 2.0, remote software version Cisco-1.25

01:21:03 debug1: compat_banner: match: Cisco-1.25 pat Cisco-1.* compat 0x60000000

01:21:03 debug2: fd 3 setting O_NONBLOCK

01:21:03 debug1: Authenticating to 172.15.20.1:22 as 'jaraujo'

01:21:03 debug1: load_hostkeys: fopen /Users/skyones/.ssh/known_hosts2: No such file or directory

01:21:03 Authenticating…

01:21:03 debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory

01:21:03 debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory

01:21:03 debug3: order_hostkeyalgs: no algorithms matched; accept original

01:21:03 debug3: send packet: type 20

01:21:03 debug1: SSH2_MSG_KEXINIT sent

01:21:03 debug3: receive packet: type 20

01:21:03 debug1: SSH2_MSG_KEXINIT received

01:21:03 debug2: local client KEXINIT proposal

01:21:03 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

01:21:03 debug2: host key algorithms: ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa

01:21:03 debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com

01:21:03 debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com

01:21:03 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

01:21:03 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

01:21:03 debug2: compression ctos: none,zlib@openssh.com,zlib

01:21:03 debug2: compression stoc: none,zlib@openssh.com,zlib

01:21:03 debug2: languages ctos:

01:21:03 debug2: languages stoc:

01:21:03 debug2: first_kex_follows 0

01:21:03 debug2: reserved 0

01:21:03 debug2: peer server KEXINIT proposal

01:21:03 debug2: KEX algorithms: diffie-hellman-group14-sha256

01:21:03 debug2: host key algorithms: ssh-rsa

01:21:03 debug2: ciphers ctos: aes128-gcm@openssh.com,aes256-ctr,aes256-cbc,aes192-ctr,aes192-cbc,aes128-ctr,aes128-cbc,chacha20-poly1305@openssh.com

01:21:03 debug2: ciphers stoc: aes128-gcm@openssh.com,aes256-ctr,aes256-cbc,aes192-ctr,aes192-cbc,aes128-ctr,aes128-cbc,chacha20-poly1305@openssh.com

01:21:03 debug2: MACs ctos: hmac-sha2-256

01:21:03 debug2: MACs stoc: hmac-sha2-256

01:21:03 debug2: compression ctos: none

01:21:03 debug2: compression stoc: none

01:21:03 debug2: languages ctos:

01:21:03 debug2: languages stoc:

01:21:03 debug2: first_kex_follows 0

01:21:03 debug2: reserved 0

01:21:03 debug1: kex: algorithm: diffie-hellman-group14-sha256

01:21:03 debug1: kex: host key algorithm: ssh-rsa

01:21:03 debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: compression: none

01:21:03 debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: compression: none

01:21:03 debug2: bits set: 1038/2048

01:21:03 debug3: send packet: type 30

01:21:03 debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

01:21:03 Connection closed by 172.15.20.1 port 22

01:21:03 Abnormal Disconnect

01:23:51 Request master to change grid size to GridSize(147, 54)

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Equivalent Command: ssh -vvv -o HostKeyAlgorithms=+ssh-rsa -o KexAlgorithms=+diffie-hellman-group14-sha1 -o ServerAliveCountMax=3 -o ServerAliveInterval=15 -o ExitOnForwardFailure=yes -p 22 jaraujo@172.15.20.1

01:23:56 Connecting…

01:23:56 Using Core Helper 6.6 (r3386)

01:23:56 OpenSSH_8.8p1, OpenSSL 1.1.1l 24 Aug 2021

01:23:56 debug1: Reading configuration data /Users/skyones/.ssh/config

01:23:56 debug1: Reading configuration data /etc/ssh/ssh_config

01:23:56 debug1: /etc/ssh/ssh_config line 21: include /etc/ssh/ssh_config.d/* matched no files

01:23:56 debug1: /etc/ssh/ssh_config line 54: Applying options for *

01:23:56 debug2: resolve_canonicalize: hostname 172.15.20.1 is address

01:23:56 debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/Users/skyones/.ssh/known_hosts'

01:23:56 debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/Users/skyones/.ssh/known_hosts2'

01:23:56 debug3: ssh_connect_direct: entering

01:23:56 debug1: Connecting to 172.15.20.1 [172.15.20.1] port 22.

01:23:56 debug3: set_sock_tos: set socket 3 IP_TOS 0x48

01:23:56 debug1: Connection established.

01:23:56 debug1: identity file /Users/skyones/.ssh/id_rsa type -1

01:23:56 debug1: identity file /Users/skyones/.ssh/id_rsa-cert type -1

01:23:56 debug1: identity file /Users/skyones/.ssh/id_dsa type -1

01:23:56 debug1: identity file /Users/skyones/.ssh/id_dsa-cert type -1

01:23:56 debug1: identity file /Users/skyones/.ssh/id_ecdsa type -1

01:23:56 debug1: identity file /Users/skyones/.ssh/id_ecdsa-cert type -1

01:23:56 debug1: identity file /Users/skyones/.ssh/id_ecdsa_sk type -1

01:23:56 debug1: identity file /Users/skyones/.ssh/id_ecdsa_sk-cert type -1

01:23:56 debug1: identity file /Users/skyones/.ssh/id_ed25519 type -1

01:23:56 debug1: identity file /Users/skyones/.ssh/id_ed25519-cert type -1

01:23:56 debug1: identity file /Users/skyones/.ssh/id_ed25519_sk type -1

01:23:56 debug1: identity file /Users/skyones/.ssh/id_ed25519_sk-cert type -1

01:23:56 debug1: identity file /Users/skyones/.ssh/id_xmss type -1

01:23:56 debug1: identity file /Users/skyones/.ssh/id_xmss-cert type -1

01:23:56 debug1: Local version string SSH-2.0-OpenSSH_8.8

01:23:56 debug1: Remote protocol version 2.0, remote software version Cisco-1.25

01:23:56 debug1: compat_banner: match: Cisco-1.25 pat Cisco-1.* compat 0x60000000

01:23:56 debug2: fd 3 setting O_NONBLOCK

01:23:56 debug1: Authenticating to 172.15.20.1:22 as 'jaraujo'

01:23:56 debug1: load_hostkeys: fopen /Users/skyones/.ssh/known_hosts2: No such file or directory

01:23:56 debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory

01:23:56 Authenticating…

01:23:56 debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory

01:23:56 debug3: order_hostkeyalgs: no algorithms matched; accept original

01:23:56 debug3: send packet: type 20

01:23:56 debug1: SSH2_MSG_KEXINIT sent

01:23:56 debug3: receive packet: type 20

01:23:56 debug1: SSH2_MSG_KEXINIT received

01:23:56 debug2: local client KEXINIT proposal

01:23:56 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

01:23:56 debug2: host key algorithms: ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa

01:23:56 debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com

01:23:56 debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com

01:23:56 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

01:23:56 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

01:23:56 debug2: compression ctos: none,zlib@openssh.com,zlib

01:23:56 debug2: compression stoc: none,zlib@openssh.com,zlib

01:23:56 debug2: languages ctos:

01:23:56 debug2: languages stoc:

01:23:56 debug2: first_kex_follows 0

01:23:56 debug2: reserved 0

01:23:56 debug2: peer server KEXINIT proposal

01:23:56 debug2: KEX algorithms: diffie-hellman-group14-sha256

01:23:56 debug2: host key algorithms: ssh-rsa

01:23:56 debug2: ciphers ctos: aes128-gcm@openssh.com,aes256-ctr,aes256-cbc,aes192-ctr,aes192-cbc,aes128-ctr,aes128-cbc,chacha20-poly1305@openssh.com

01:23:56 debug2: ciphers stoc: aes128-gcm@openssh.com,aes256-ctr,aes256-cbc,aes192-ctr,aes192-cbc,aes128-ctr,aes128-cbc,chacha20-poly1305@openssh.com

01:23:56 debug2: MACs ctos: hmac-sha2-256

01:23:56 debug2: MACs stoc: hmac-sha2-256

01:23:56 debug2: compression ctos: none

01:23:56 debug2: compression stoc: none

01:23:56 debug2: languages ctos:

01:23:56 debug2: languages stoc:

01:23:56 debug2: first_kex_follows 0

01:23:56 debug2: reserved 0

01:23:56 debug1: kex: algorithm: diffie-hellman-group14-sha256

01:23:56 debug1: kex: host key algorithm: ssh-rsa

01:23:56 debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: compression: none

01:23:56 debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: compression: none

01:23:56 debug2: bits set: 1012/2048

01:23:56 debug3: send packet: type 30

01:23:56 debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

01:23:56 Connection closed by 172.15.20.1 port 22

01:23:56 Abnormal Disconnect

Hi Jose,

Could you please run the command in Terminal or local shell in Core Shell:

ssh -vvv -o HostKeyAlgorithms=+ssh-rsa -o KexAlgorithms=+diffie-hellman-group14-sha1 -o ServerAliveCountMax=3 -o ServerAliveInterval=15 -o ExitOnForwardFailure=yes -p 22 jaraujo@172.15.20.1

Then send me the printed output?

Thank you,

Yang

skyones@MPM1 ~ % ssh -vvv -o HostKeyAlgorithms=+ssh-rsa -o KexAlgorithms=+diffie-hellman-group14-sha1 -o ServerAliveCountMax=3 -o ServerAliveInterval=15 -o ExitOnForwardFailure=yes -p 22 jaraujo@172.15.20.1

OpenSSH_9.0p1, LibreSSL 3.3.6

debug1: Reading configuration data /Users/skyones/.ssh/config

debug1: Reading configuration data /etc/ssh/ssh_config

debug1: /etc/ssh/ssh_config line 21: include /etc/ssh/ssh_config.d/* matched no files

debug1: /etc/ssh/ssh_config line 54: Applying options for *

debug2: resolve_canonicalize: hostname 172.15.20.1 is address

debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/Users/skyones/.ssh/known_hosts'

debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/Users/skyones/.ssh/known_hosts2'

debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling

debug3: ssh_connect_direct: entering

debug1: Connecting to 172.15.20.1 [172.15.20.1] port 22.

debug3: set_sock_tos: set socket 3 IP_TOS 0x48

debug1: Connection established.

debug1: identity file /Users/skyones/.ssh/id_rsa type -1

debug1: identity file /Users/skyones/.ssh/id_rsa-cert type -1

debug1: identity file /Users/skyones/.ssh/id_ecdsa type -1

debug1: identity file /Users/skyones/.ssh/id_ecdsa-cert type -1

debug1: identity file /Users/skyones/.ssh/id_ecdsa_sk type -1

debug1: identity file /Users/skyones/.ssh/id_ecdsa_sk-cert type -1

debug1: identity file /Users/skyones/.ssh/id_ed25519 type -1

debug1: identity file /Users/skyones/.ssh/id_ed25519-cert type -1

debug1: identity file /Users/skyones/.ssh/id_ed25519_sk type -1

debug1: identity file /Users/skyones/.ssh/id_ed25519_sk-cert type -1

debug1: identity file /Users/skyones/.ssh/id_xmss type -1

debug1: identity file /Users/skyones/.ssh/id_xmss-cert type -1

debug1: identity file /Users/skyones/.ssh/id_dsa type -1

debug1: identity file /Users/skyones/.ssh/id_dsa-cert type -1

debug1: Local version string SSH-2.0-OpenSSH_9.0

debug1: Remote protocol version 2.0, remote software version Cisco-1.25

debug1: compat_banner: match: Cisco-1.25 pat Cisco-1.* compat 0x60000000

debug2: fd 3 setting O_NONBLOCK

debug1: Authenticating to 172.15.20.1:22 as 'jaraujo'

debug1: load_hostkeys: fopen /Users/skyones/.ssh/known_hosts2: No such file or directory

debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory

debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory

debug3: order_hostkeyalgs: no algorithms matched; accept original

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: sntrup761x25519-sha512@openssh.com,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: ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,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: diffie-hellman-group14-sha256

debug2: host key algorithms: ssh-rsa

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

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

debug2: MACs ctos: hmac-sha2-256

debug2: MACs stoc: hmac-sha2-256

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: diffie-hellman-group14-sha256

debug1: kex: host key algorithm: ssh-rsa

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

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

debug2: bits set: 1016/2048

debug3: send packet: type 30

debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

Connection closed by 172.15.20.1 port 22

skyones@MPM1 ~ %

Very strange issue, it didn't prompt any explicit error. I found this topic that may help:

Could you please try lowering MUT of you local ethernet interface?

https://discussions.apple.com/thread/8168068

Kindly Regards,

Yang