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.
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 channel.open() 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.
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')