plink.exe

What is plink.exe?

plink.exe is the PuTTY command-line SSH client designed for automation. It enables non-interactive remote command execution, port forwarding, and scripted sessions from Windows without launching a graphical terminal. Used in batch tasks, CI pipelines, and admin workflows, plink.exe is legitimate when obtained from the official PuTTY distribution.

plink.exe wraps PuTTY’s SSH capabilities into a compact CLI tool. It supports password and key-based authentication, agent usage, and command execution in batch style, returning output to scripts. It shares the PuTTY codebase and security model, including host key verification.

Is it Safe?

Is it a Virus?

1. : Locate plink.exe in a PuTTY installation folder and verify the digital signature.
2. : Check the file’s certificate chain and publisher using File Properties or signtool.
3. : Compute the SHA-256 hash with certutil and compare to the official PuTTY release hash.
4. : Run a malware scan with Windows Defender or another trusted AV and review any detections.

Why is it Running?

Reasons it's running:

• Automated remote command execution: Administrators and developers use plink.exe to run commands on remote servers as part of deployment scripts or batch jobs without opening a GUI.
• CI/CD workflow integration: Build and release pipelines rely on plink.exe to orchestrate tasks on Linux/Unix hosts from Windows runners.
• Port forwarding and tunneling: Plink.exe establishes SSH tunnels for secure access to internal resources during maintenance or testing.
• Non-interactive sessions for scripting: Plink.exe provides non-interactive shells that return stdout/stderr to scripts for logging and automation.
• Wrapper integrations with PuTTY tools: Scripts may call plink.exe alongside pscp, puttygen, or other PuTTY utilities to complete complex SSH workflows.

Can I Disable or Remove It?

Common Problems

Common Causes & Solutions

• : Verify the host, port, and network path; ensure the remote SSH service is listening; check firewall rules on both ends.
• : Update known_hosts with the correct host key, or remove the stale entry and reconnect to prompt a new key acceptance.
• : Confirm user credentials or use the correct private key with -i; ensure the server accepts the chosen authentication method.
• : Install PuTTY in a standard directory (e.g., C:\Program Files\PuTTY) or add its folder to the PATH environment variable.
• : Stream output to a file or use proper command constructs to handle large stdout; consider using -ssh for explicit SSH mode.
• : Double-check -L/-R syntax, ensure the remote service is accessible, and confirm that the SSH server allows tunnels.

Related Processes