SSH 安全複製被拒絕/超時

我對 Linux 遊戲比較陌生。我與遠端主機建立了 SSH 連接，並嘗試將遠端主機的副本 (scp) 保護到我的本地電腦。我在 Oracle VM 上執行 Linux Ubuntu。

當我執行 ssh-v 時：

OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n  7 Dec 2017
debug1: Reading configuration data /home/USER/.ssh/config
debug1: /home/USER/.ssh/config line 1: Applying options for novagpvm01
debug1: Connecting to HOSTNAME [HOSTIP] port 22.
debug1: Connection established.
debug1: identity file /home/USER/.ssh/id_rsa type 0
debug1: key_load_public: No such file or directory
debug1: identity file /home/USER/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/USER/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/USER/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/USER/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/USER/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/USER/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/USER/.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_5.3
debug1: match: OpenSSH_5.3 pat OpenSSH_5* compat 0x0c000000
debug1: Authenticating to HOSTNAME:22 as 'USER'
debug1: Offering GSSAPI proposal: gss-gex-sha1-toWM8Slw8Ew8Mqkay+al2g==,gss-group1-sha1-
toWM5Slw5Ew8Mqkay+al2g==,gss-group14-sha1-toWM5Slw5Ew8Mqkay+al2g==,gss-gex-sha1- 
eipGX3TCiTUrx573bT1o1Q==,gss-group1-sha1-eipGX3TCiQSrx573bT1o1Q==,gss-group14-sha1-
eipGX3TCiTUrx573bT1o1Q==
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: gss-gex-sha1-toWM8Slw8Ew8Mqkay+al2g==
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: aes128-ctr MAC: umac-64@openssh.com compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: umac-64@openssh.com compression: none
debug1: Doing group exchange
debug1: Calling gss_init_sec_context
debug1: Delegating credentials
debug1: Received GSSAPI_COMPLETE
debug1: Calling gss_init_sec_context
debug1: Delegating credentials
debug1: Rekey has happened - updating saved versions
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: gssapi-keyex,gssapi-with-mic
debug1: Next authentication method: gssapi-keyex
debug1: Authentication succeeded (gssapi-keyex).
Authenticated to HOSTNAME ([HOSTIP]:22).
debug1: Local connections to LOCALHOST:5901 forwarded to remote address localhost:5904
debug1: Local forwarding listening on 127.0.0.1 port 5901.
debug1: channel 0: new [port listener]
debug1: Local forwarding listening on ::1 port 5901.
bind: Cannot assign requested address
debug1: channel 1: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: pledge: exec
debug1: Requesting X11 forwarding with authentication spoofing.
debug1: Requesting authentication agent forwarding.

所以以上說明建立了SSH。當我執行安全副本（在我的本地）時，其格式如下：

scp -r -v USER1@HOSTNAME:FOLDERPATH ~/home/USER/folder

我收到以下錯誤：

debug1: Authentications that can continue: gssapi-keyex,gssapi-with-mic
debug3: start over, passed a different list gssapi-keyex,gssapi-with-mic
debug3: preferred publickey,keyboard-interactive,password
debug1: No more authentication methods to try.
user@domain: Permission denied (gssapi-keyex,gssapi-with-mic).

我已經查看了主機和本地的配置文件，它們是以前的文章和主機推薦的。我嘗試使用我的 IP 地址並收到連接超時錯誤。當我得到以下資訊時，它似乎也不是關鍵錯誤：

debug1: Server host key: ssh-rsa SHA256:xn0AoXgnMHKa8f9z9a9bClSHotypJqbIz8Vrw6MxNTc
debug3: hostkeys_foreach: reading file "/home/user/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file /home/user/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from host.com
debug3: hostkeys_foreach: reading file "/home/user/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file /home/user/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys from XXX.XXX.XX.XX
debug1: Host 'host.com' is known and matches the RSA host key.
debug1: Found key in /home/user/.ssh/known_hosts:1

我的想法不多了，非常感謝一些指導。謝謝！

我的錯，對不起。這是一個問題：

debug1: Local forwarding listening on ::1 port 5901.
bind: Cannot assign requested address
debug1: channel 1: new [client-session]

看起來您正在嘗試將 ssh 程序重新綁定到 ::1 埠 5901（通常用於 vnc），並且它已被另一個程序使用。

sudo netstat -anp | grep 5901

或者

ss -tunap | grep 5901

應該辨識過程。

使用的預設密鑰交換算法不兼容。如果您檢查 ssh_config 的聯機幫助頁，例如

$ man ssh_config

並查找 GSSAPIKexAlgorithms，您會找到可能的選項。你像這樣應用它們

$ scp -o GSSAPIKexAlgorithms=gss-nistp256-sha256- -r -v USER1@HOSTNAME:FOLDERPATH ~/home/USER/folder

引用自：https://unix.stackexchange.com/questions/599810