问单方向sftp超时问题

EN

摘要:我正在尝试从我的笔记本电脑连接到我的桌面，用sftp username@localIP传输文件，但是它给了我连接超时时间

案例:这两台机器都使用Linux并连接到同一个路由器:机器1:使用与第二台机器连接的USB绑定电话连接到internet的桌面2:使用无线连接到internet的膝上型计算机。

使用hostname -I的每个设备的IP :桌面：192.168.42.130膝上型计算机：192.168.1.2

问题:我可以连接从桌面到笔记本电脑，但反之亦然。我经常在桌面->膝上型电脑上使用它，但是每次我尝试从笔记本->桌面连接时，都会发生这样的情况：(花费2分钟) (ssh:连接到主机192.168.42.130端口22:连接超时连接关闭)

( 1)尝试将GSPAuthentication设置为No2)尝试将UseDNS设置为No3)重新启动服务

但没有结果

更新:下面是对问题进行扫描后的结果(@A.B表示问题是NAT造成的)

注意:联想(i.e.laptop)的缩写:路由器上只有两台Linux机器:我没有电线，所以我在桌面上用手机连接互联网(使用USB绑定)。

1)从笔记本电脑连接->桌面：omar@omar-Len:~/Desktop$ sftp omar@192.168.1.8 ssh: connect to host 192.168.1.8 port 22: Connection refused Connection closed

2)检查桌面地址(连接前)：omar@omar-LDesktop:~$ ip -brief address lo UNKNOWN 127.0.0.1/8 ::1/128 enp0s25 DOWN enp0s29f7u2 UNKNOWN 192.168.42.130/24 fe80::69ce:4a20:5a7e:433c/64

3)在笔记本电脑上检查打开的连接(在连接两台机器之前)：omar@omar-Len:~/Desktop$ netstat -tn | egrep -w 22 omar@omar-Len:~/Desktop$

(从pc->膝上型电脑连接这两台机器)

4)检查打开的连接：(桌面) omar@omar-LDesktop:~$ netstat -tn | egrep -w 22 tcp 0 0 192.168.42.130:44644 192.168.1.2:22 ESTABLISHED

(膝上型电脑) omar@omar-Len:~/Desktop$ netstat -tn | egrep -w 22 tcp 0 0 192.168.1.2:22 192.168.1.8:44644 ESTABLISHED

(桌面) omar@omar-LDesktop:~$ ps -ef | grep [s]shd root 30538 1 0 19:07 ? 00:00:00 /usr/sbin/sshd -D

更新2：(我想通过互联网连接这两台机器以避免NAT，这是我的尝试)

我使用sftp -vvv @从桌面->膝上型计算机连接，它向我询问密码，当我输入密码时，它返回“拒绝权限”，尽管如果我不使用，它连接正常。

下面是桌面的调试日志：(注意，我更改了我的)

sftp -vvv @omar-@omar-Len@192.168.1.2 OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n 7 Dec 2017 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug2: resolving "192.168.1.2" port 22 debug2: ssh_connect_direct: needpriv 0 debug1: Connecting to 192.168.1.2 [192.168.1.2] port 22. debug1: Connection established. debug1: key_load_public: No such file or directory debug1: identity file /home/omar/.ssh/id_rsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/omar/.ssh/id_rsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/omar/.ssh/id_dsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/omar/.ssh/id_dsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/omar/.ssh/id_ecdsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/omar/.ssh/id_ecdsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/omar/.ssh/id_ed25519 type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/omar/.ssh/id_ed25519-cert type -1 debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 pat OpenSSH* compat 0x04000000 debug2: fd 3 setting O_NONBLOCK debug1: Authenticating to 192.168.1.2:22 as '@omar-@omar-Len' debug3: hostkeys_foreach: reading file "/home/omar/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file /home/omar/.ssh/known_hosts:1 debug3: load_hostkeys: loaded 1 keys from 192.168.1.2 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-group-exchange-sha1,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,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-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1 debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519 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 debug2: compression stoc: none,zlib@openssh.com 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: 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: SHA256: debug3: hostkeys_foreach: reading file "/home/omar/.ssh/known_hosts" debug3: record_hostkey: found key type ECDSA in file /home/omar/.ssh/known_hosts:1 debug3: load_hostkeys: loaded 1 keys from 192.168.1.2 debug1: Host '192.168.1.2' is known and matches the ECDSA host key. debug1: Found key in /home/omar/.ssh/known_hosts:1 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 debug1: SSH2_MSG_NEWKEYS received debug2: set_newkeys: mode 0 debug1: rekey after 134217728 blocks debug2: key: /home/omar/.ssh/id_rsa ((nil)) debug2: key: /home/omar/.ssh/id_dsa ((nil)) debug2: key: /home/omar/.ssh/id_ecdsa ((nil)) debug2: key: /home/omar/.ssh/id_ed25519 ((nil)) debug3: send packet: type 5 debug3: receive packet: type 7 debug1: SSH2_MSG_EXT_INFO received debug1: kex_input_ext_info: server-sig-algs= 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-keyex,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: Trying private key: /home/omar/.ssh/id_rsa debug3: no such identity: /home/omar/.ssh/id_rsa: No such file or directory debug1: Trying private key: /home/omar/.ssh/id_dsa debug3: no such identity: /home/omar/.ssh/id_dsa: No such file or directory debug1: Trying private key: /home/omar/.ssh/id_ecdsa debug3: no such identity: /home/omar/.ssh/id_ecdsa: No such file or directory debug1: Trying private key: /home/omar/.ssh/id_ed25519 debug3: no such identity: /home/omar/.ssh/id_ed25519: 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 @omar-@omar-Len@192.168.1.2's password: debug3: send packet: type 50 debug2: we sent a password packet, wait for reply debug3: receive packet: type 51 debug1: Authentications that can continue: publickey,password Permission denied, please try again.

这是笔记本电脑的调试：May 4 14:59:39 omar-Len sshd[10133]: Invalid user @omar-@omar-Len from 192.168.1.8 port 56890 May 4 14:59:44 omar-Len sshd[10133]: pam_unix(sshd:auth): check pass; user unknown May 4 14:59:44 omar-Len sshd[10133]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.1.8 May 4 14:59:47 omar-Len sshd[10133]: Failed password for invalid user @omar-@omar-Len from 192.168.1.8 port 56890 ssh2 May 4 14:59:49 omar-Len sshd[10133]: Connection closed by invalid user @omar-@omar-Len 192.168.1.8 port 56890 [preauth] May 4 15:03:50 omar-Len sudo: omar : TTY=pts/0 ; PWD=/home/omar/Desktop ; USER=root ; COMMAND=/bin/nano //var/log/auth.log May 4 15:03:50 omar-Len sudo: pam_unix(sudo:session): session opened for user root by (uid=0) May 4 15:04:12 omar-Len sudo: pam_unix(sudo:session): session closed for user root