Fixing paramiko.ssh_exception.SSHException: Channel closed

Let’s check methods to resolve the paramiko.ssh_exception.SSHException: Channel closed error, which commonly occurs in Python scripts utilizing Paramiko for SSH communication.

Check Network Stability

Ensure the network connection between the client and server is stable. Test with standard SSH clients to determine if the issue is network-related or specific to Paramiko.

See also  Resolving AuthenticationException: Securing Your Paramiko Connection

Verify Server Configuration

Inspect the server’s SSH configuration for settings that might close connections automatically, such as ClientAliveInterval and TCPKeepAlive, and adjust as needed.

Review Paramiko Usage in Your Code

Ensure that the SSH connection and channel are properly managed in your code, opening the channel with and checking its status with channel.is_active().

Handle Exceptions Properly

Use try-except blocks to catch SSHException and manage it effectively, perhaps by retrying the connection or providing useful error feedback.

See also  Handling Paramiko Errors and Timeouts

Update Paramiko and Dependencies

Ensure you’re using the latest version of Paramiko and its dependencies to benefit from recent bug fixes and improvements.

Increase Verbosity for Debugging

Enable detailed logging in Paramiko to gain insight into the actions leading up to the channel closure:

import paramiko
paramiko.util.log_to_file('paramiko.log', level='DEBUG')