无法通过SSH共享连接执行scp操作的技术求助

Alright, let's work through this SCP issue with your shared SSH connection. Since you're using public key auth via an SSH agent and connection multiplexing, there are a few targeted checks and fixes to get things working:

• Verify your shared connection configuration
  First, double-check your ~/.ssh/config settings for the target host. Make sure you have multiplexing enabled with a valid, secure control path:

  Host your-target-host
    HostName your-server-ip-or-domain
    User your-username
    ControlMaster auto
    ControlPath ~/.ssh/sockets/%r@%h-%p
    ControlPersist yes
    ForwardAgent yes
  

  Critical notes here:

  • The ~/.ssh/sockets directory must exist (create it with mkdir -m 700 ~/.ssh/sockets if it doesn't)
  • The directory and control path files need strict permissions (chmod 700 ~/.ssh/sockets ensures SSH will trust them)
  • ForwardAgent yes ensures your SSH agent is available to the shared connection for auth

• Confirm the shared connection is active
  Before running SCP, check if the master connection is actually running with:

  ssh -O check your-target-host
  

  You should see output like Master running (pid 12345). If you get an error, establish the master connection first by running a regular ssh your-target-host (keep this session open or let ControlPersist handle background persistence).

• Force SCP to use the shared connection explicitly
  Sometimes SCP might not pick up your config settings automatically (especially if you're using a non-OpenSSH SCP implementation). Test with explicit flags to tie it to your shared connection:

  scp -o ControlMaster=auto -o ControlPath=~/.ssh/sockets/%r@%h-%p /path/to/local/file your-target-host:/path/to/remote/location
  

  If this works, your config might have a typo, or your system's default SCP isn't using your ~/.ssh/config (try using scp -F ~/.ssh/config to force it).

• Check SSH agent availability for SCP
  Ensure the SSH_AUTH_SOCK environment variable is set correctly in the shell where you're running SCP. It should match the value from the shell where you established the master connection. Verify with:

  echo $SSH_AUTH_SOCK
  

  If it's missing or incorrect, export the correct path (you can get it from the working SSH session) before running SCP.

• Troubleshoot with verbose output
  If you're still hitting errors, run SCP with verbose mode to get more details:

  scp -v /path/to/local/file your-target-host:/path/to/remote/location
  

  Look for lines about control path access, agent auth, or connection failures—these will point you directly to the root issue (e.g., permission denied on the control socket, agent not forwarded).

Give these steps a shot, and if you run into specific error messages, share them and we can dig deeper.

内容的提问来源于stack exchange，提问作者Dave