Ubuntu桌面环境下，如何SSH连接无法直接访问的服务器？

Alright, let's cut through that annoying VM/PuTTY hoopla and get your Ubuntu Desktop (D) connected directly to server S. Dealing with environment mismatches, broken copy-paste, and wonky Alt-Tab is no fun—here are three solid fixes to solve this for good:

Since you can already reach S via your Windows VM, we can use that VM as a middleman to forward SSH traffic from your Ubuntu host. Here's how:

• First, make sure your Windows VM and Ubuntu desktop are on the same network (use bridge mode or host-only networking in your hypervisor) and can ping each other.
• On your Ubuntu terminal, run this command to set up local port forwarding:

  ssh -L 2222:S_IP:22 windows_vm_username@windows_vm_ip
  

  Breakdown: -L tells SSH to forward traffic from your Ubuntu's port 2222 to server S's port 22, routed through the Windows VM. Replace the placeholders with your actual VM username/IP and server S's IP.
• Enter your Windows VM's password when prompted, and keep this terminal window open. Now open a new Ubuntu terminal and connect directly to your local forwarded port:

  ssh s_username@localhost -p 2222
  

  This drops you straight into server S, using Ubuntu's native terminal—copy-paste and Alt-Tab will work like normal.

If you want to skip typing long commands every time, set up your SSH config file to handle the jump automatically:

• Open your Ubuntu SSH config file in a text editor:

  nano ~/.ssh/config
  

• Paste in this configuration (replace placeholders with your actual details):

  Host windows-vm
      HostName windows_vm_ip
      User windows_vm_username
  
  Host server-s
      HostName S_IP
      User s_username
      ProxyJump windows-vm
  

• Save and close the file (Ctrl+O, Enter, then Ctrl+X in nano). Now you can connect to server S with a single command:

  ssh server-s
  

  SSH will automatically connect to your Windows VM first, then jump to server S—all in your native Ubuntu terminal.

The most permanent fix is to bypass the firewall block entirely, if you manage the firewall or server S:

• On server S (if it uses UFW), allow incoming SSH from your Ubuntu desktop's IP:

  ufw allow from D_IP to any port 22
  

• If using iptables instead:

  iptables -A INPUT -s D_IP -p tcp --dport 22 -j ACCEPT
  

Once this rule is applied, you can connect directly from Ubuntu to server S with a simple ssh s_username@S_IP—no VM required.

Quick Notes: #

• For method 1/2, make sure your Windows VM has OpenSSH Server enabled (you can install it via Windows Settings > Apps > Optional Features).
• If your Ubuntu has an older SSH version (pre-7.3), replace ProxyJump with ProxyCommand ssh -W %h:%p windows-vm in the config file.

内容的提问来源于stack exchange，提问作者blueFast