Unable to log in from the public network ssh

I intend to connect to the ubuntu, at home through ssh on the public network. The current situation is as follows:

  • Home bandwidth has public network IP, and ssh port of ubuntu is mapped to public network through router port mapping
  • the ubuntu of the private network connection at home is normal. Public network access can establish a TCP connection, but cannot log in
  • obtain detailed connection information through ssh-vvv IP-p 22333 as follows 
OpenSSH_5.3p1, OpenSSL 1.0.1e-fips 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to IP port 22333.
debug1: Connection established.
debug1: identity file /home/treesea/.ssh/identity type -1
debug1: identity file /home/treesea/.ssh/identity-cert type -1
debug3: Not a RSA1 key file /home/treesea/.ssh/id_rsa.
debug2: key_type_from_name: unknown key type "-----BEGIN"
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type "-----END"
debug3: key_read: missing keytype
debug1: identity file /home/treesea/.ssh/id_rsa type 1
debug1: identity file /home/treesea/.ssh/id_rsa-cert type -1
debug1: identity file /home/treesea/.ssh/id_dsa type -1
debug1: identity file /home/treesea/.ssh/id_dsa-cert type -1
debug1: identity file /home/treesea/.ssh/id_ecdsa type -1
debug1: identity file /home/treesea/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4
debug1: match: OpenSSH_7.6p1 Ubuntu-4 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug3: Wrote 864 bytes for a total of 885
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa-cert-v01@openssh.com,ssh-dss-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-dss-cert-v00@openssh.com,ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-sha1,umac-64@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96
debug2: kex_parse_kexinit: hmac-sha1,umac-64@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: kex_parse_kexinit: 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
debug2: kex_parse_kexinit: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: kex_parse_kexinit: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: kex_parse_kexinit: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: kex_parse_kexinit: 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: kex_parse_kexinit: 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: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: mac_setup: found hmac-sha1
debug1: kex: server->client aes128-ctr hmac-sha1 none
debug2: mac_setup: found hmac-sha1
debug1: kex: client->server aes128-ctr hmac-sha1 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<2048<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug3: Wrote 24 bytes for a total of 909
Connection closed by IP
sshd_config of

ubuntu is as follows 

   1   | -sharp       $OpenBSD: sshd_config,v 1.101 2017/03/14 07:19:07 djm Exp $
   2    
   3    -sharp This is the sshd server system-wide configuration file.  See
   4    -sharp sshd_config(5) for more information.
   5    
   6    -sharp This sshd was compiled with PATH=/usr/bin:/bin:/usr/sbin:/sbin
   7    
   8    -sharp The strategy used for options in the default sshd_config shipped with
   9    -sharp OpenSSH is to specify options with their default value where
  10    -sharp possible, but leave them commented.  Uncommented options override the
  11    -sharp default value.
  12    
  13    -sharpPort 22
  14    -sharpAddressFamily any
  15    -sharpListenAddress 0.0.0.0
  16    -sharpListenAddress ::
  17    
  18    -sharpHostKey /etc/ssh/ssh_host_rsa_key
  19    -sharpHostKey /etc/ssh/ssh_host_ecdsa_key
  20    -sharpHostKey /etc/ssh/ssh_host_ed25519_key
  21    
  22    -sharp Ciphers and keying
  23    -sharpRekeyLimit default none
  24    
  25    -sharp Logging
  26    -sharpSyslogFacility AUTH
  27    -sharpLogLevel INFO
  28    
  29    -sharp Authentication:
  30    
  31    -sharpLoginGraceTime 2m
  32    -sharpPermitRootLogin prohibit-password
  33    -sharpStrictModes yes
  34    -sharpMaxAuthTries 6
  35    -sharpMaxSessions 10
  36    
  37    -sharpPubkeyAuthentication yes
  38    
  39    -sharp Expect .ssh/authorized_keys2 to be disregarded by default in future.
  40    -sharpAuthorizedKeysFile     .ssh/authorized_keys .ssh/authorized_keys2
  41    
  42    -sharpAuthorizedPrincipalsFile none
  43    
  44    -sharpAuthorizedKeysCommand none
  45    -sharpAuthorizedKeysCommandUser nobody
  46    
  47    -sharp For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
  48    -sharpHostbasedAuthentication no
  49    -sharp Change to yes if you don"t trust ~/.ssh/known_hosts for
  50    -sharp HostbasedAuthentication
Ssh
Oct.14,2021

Port 22 is not blocked. Check it.

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