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henriquehbr
Asked: 2022-03-08 07:48:02 +0800 CST

SSH 服务器拒绝来自同一个客户端的多个连接

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我有一个在 Alpine Linux 3.15 Docker 容器中运行的简单 openssh 服务器，以及另一个容器，也运行相同版本的 Alpine 的 SSH 服务器）运行带有 dwm 的 X 服务器

我正在st使用以下命令从 X 服务器连接到 SSH 服务器（并正在运行）：

ssh -v -t [email protected] st

SSH 服务器正在使用以下命令执行：

/usr/bin/sshd -D -d -e

$DISPLAY变量设置为ssh:10（作为sshSSH 服务器主机名）

客户端能够通过从服务器到客户端显示的 X11 转发打开图形应用程序（ ），问题是在收到以下错误之前st我只能打开单个实例：st

ssh: connect to host 172.17.0.2 port 22: Connection refused

服务器端日志：

Starting session: command on pts/1 for client from 172.17.0.3 port 34060 id 0
debug1: Setting controlling tty using TIOCSCTTY.
debug1: X11 connection requested.
debug1: channel 3: new [X11 connection from 172.17.0.2 port 35028]
debug1: Received SIGCHLD.
debug1: session_by_pid: pid 9
debug1: session_exit_message: session 0 channel 0 pid 9
debug1: session_exit_message: release channel 0
debug1: session_by_tty: session 0 tty /dev/pts/1
debug1: session_pty_cleanup2: session 0 release /dev/pts/1
debug1: channel 3: free: X11 connection from 172.17.0.2 port 35028, nchannels 4
debug1: session_by_channel: session 0 channel 0
debug1: session_close_by_channel: channel 0 child 0
debug1: session_close_x11: detach x11 channel 1
debug1: session_close_x11: detach x11 channel 2
Close session: user client from 172.17.0.3 port 34060 id 0
debug1: channel 0: free: server-session, nchannels 3
debug1: channel 1: free: X11 inet listener, nchannels 2
debug1: channel 2: free: X11 inet listener, nchannels 1
Received disconnect from 172.17.0.3 port 34060:11: disconnected by user
Disconnected from user client 172.17.0.3 port 34060
debug1: do_cleanup
debug1: do_cleanup

客户端日志：

Running /usr/bin/xauth remove ssh:10.0
/usr/bin/xauth add ssh:10.0 MIT-MAGIC-COOKIE-1 49907415ff518044198f6f0075f270fe
debug1: client_input_channel_open: ctype x11 rchan 3 win 65536 max 16384
debug1: client_request_x11: request from 172.17.0.2 35028
debug1: channel 1: new [x11]
debug1: confirm x11
OpenSSH_8.8p1, OpenSSL 1.1.1l  24 Aug 2021
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling
debug1: Connecting to 172.17.0.2 [172.17.0.2] port 22.
debug1: connect to address 172.17.0.2 port 22: Connection refused
ssh: connect to host 172.17.0.2 port 22: Connection refused
xinit: connection to X server lost

waiting for X server to shut down debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype [email protected] reply 0
debug1: channel 1: free: x11, nchannels 2
X connection to ssh:10.0 broken (explicit kill or server shutdown).
debug1: channel 0: free: client-session, nchannels 1
Connection to 172.17.0.2 closed.
Transferred: sent 91292, received 92728 bytes, in 3.1 seconds
Bytes per second: sent 29350.8, received 29812.5
debug1: Exit status 1
(II) Server terminated successfully (0). Closing log file.

deallocvt: can't open console
linux ssh

1 个回答

  1. Best Answer

    你说你正在sshd使用这个命令运行：

    /usr/bin/sshd -D -d -e

    “ -d”选项用于调试。它有这样的效果：

    调试模式。服务器将详细的调试输出发送到标准错误，并且不会将自己置于后台。服务器也不会 fork(2) 并且只会处理一个连接。此选项仅用于调试服务器。多个 -d 选项可提高调试级别。最大值为 3。

    您描述的行为，其中 sshd 只接受一个连接，然后不再接受，这正是您期望看到的“-d”选项有效。

    如果您想获得与现在相同的行为，只需sshd处理多个连接，应该这样做：

    /usr/bin/sshd -D -e -o LogLevel=DEBUG1
    • 3

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