Sftp Client - Python Paramiko Fails to Authenticate Password: Ssh/Sftp Client Works

Python Paramiko Fails to Authenticate Password: Ssh/Sftp Client Works

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Sftp Client - Python Paramiko Fails to Authenticate Password: Ssh/Sftp Client Works

If you’ve ever tried to connect to a remote server using Python’s Paramiko library, you may have encountered an issue where authentication fails despite your credentials being correct. This can be a frustrating experience that wastes valuable time and resources.

Fortunately, there are several common reasons why Paramiko may fail to authenticate a password, such as incorrect server configuration or unsupported authentication methods. By understanding these issues and taking the necessary steps to overcome them, you can ensure a successful connection to your remote server.

In this article, we’ll delve deeper into why Paramiko might fail to authenticate a password and outline the troubleshooting steps you can take to resolve this issue. Whether you’re a seasoned programmer or just starting out with Paramiko, this guide will provide valuable insights that will help you resolve any issues with ease.

So, if you want to learn more about how to troubleshoot and fix password authentication issues in Python’s Paramiko library, keep reading. By the end of this guide, you’ll be armed with the knowledge and skills you need to successfully connect to your remote server and get started on your projects.

th?q=Password%20Authentication%20In%20Python%20Paramiko%20Fails%2C%20But%20Same%20Credentials%20Work%20In%20Ssh%2FSftp%20Client - Python Paramiko Fails to Authenticate Password: Ssh/Sftp Client Works
“Password Authentication In Python Paramiko Fails, But Same Credentials Work In Ssh/Sftp Client” ~ bbaz


When it comes to remotely accessing and transferring files, SSH (Secure Shell) and SFTP (Secure File Transfer Protocol) are two of the most commonly used protocols. For Python developers, Paramiko is a popular library for implementing both SSH and SFTP clients. However, users have reported issues with Paramiko failing to authenticate passwords, while other SSH/SFTP clients work without issue. In this article, we will explore this comparison and provide an opinion on the matter.

Overview of SSH and SFTP

SSH is a protocol for securely connecting to a remote server and executing commands within a shell. SFTP, on the other hand, is a secure way to transfer files between a client and a remote server. Both protocols rely on strong encryption to protect data in transit.

The Role of Python Paramiko

Paramiko is a Python library that provides an implementation of the SSH2 protocol, allowing developers to create SSH and SFTP clients in Python. It is built to be simple to use, flexible, and highly compatible with the SSH protocol.

The Password Authentication Issue

Some Paramiko users have reported issues with the library failing to authenticate passwords when connecting to a remote server. This issue seems to be intermittent and not reproducible in all cases.

Example Code

Here is an example code snippet that illustrates how to use Paramiko to connect to an SSH server:

import paramikossh = paramiko.SSHClient()ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())ssh.connect('my.remote.server.com', username='username', password='password')stdin, stdout, stderr = ssh.exec_command('ls -l')print(stdout.read())ssh.close()

Comparison with Other SSH/SFTP Clients

While Paramiko is a useful library for implementing SSH and SFTP clients in Python, there are other options available as well. Some users have reported that other clients, such as the standard OpenSSH client or the Python ‘pexpect’ module, do not exhibit the same password authentication issue.

OpenSSH Example

Here is an example of how to use the OpenSSH client to connect to an SSH server:

ssh username@my.remote.server.com

Pexpect Example

Here is an example of how to use the pexpect module to automate an SSH session:

import pexpectchild = pexpect.spawn('ssh username@my.remote.server.com')child.expect('password:')child.sendline('password')child.expect('$')child.sendline('ls -l')child.expect('$')print(child.before)child.sendline('exit')

Table Comparison

Let’s take a look at a comparison table between Paramiko and two other SSH/SFTP clients:

Client Advantages Disadvantages
Paramiko Flexible and compatible Intermittent password authentication issue
OpenSSH Standard client included in most Unix-based systems Not easily customizable with Python
Pexpect Allows for automation of SSH sessions Not designed specifically for SSH/SFTP, can be more complex to use


Based on the comparison and reports from users, it seems that Paramiko does have an issue with intermittent password authentication. While there are workarounds and other options available, it is important for the Paramiko team to address this issue in future releases. Ultimately, the choice between Paramiko and other SSH/SFTP clients will depend on the specific needs and preferences of the developer.


SSH and SFTP are critical protocols for remotely accessing and transferring files securely. Python developers have access to several libraries for implementing SSH and SFTP clients, including the popular Paramiko library. While Paramiko is a flexible and useful option, users have reported issues with the library failing to authenticate passwords intermittently. Other SSH/SFTP clients, such as OpenSSH and Pexpect, offer their own advantages and disadvantages. Developers should choose the library that best fits their needs and keep an eye out for updates addressing issues like the password authentication problem with Paramiko.

If you’ve ended up on this page because you’re struggling with Python Paramiko failing to authenticate password, we hope our troubleshooting guide has been useful to you.

As you may know, Paramiko is a popular Python library for SSH and SFTP protocols. It’s a fantastic tool that allows developers to build powerful automation scripts and programs that can control remote servers, network devices, and other systems. However, working with Paramiko can be a bit challenging at times, especially when it comes to password authentication.

We encourage you to keep experimenting with Paramiko and other SSH/SFTP clients until you become familiar with the authentication process. Feel free to revisit this blog post for reference, and don’t hesitate to leave us a comment if you have any feedback or questions.

Thank you for visiting our blog today! We hope you found the information we provided helpful in your Python development journey. Stay tuned for more informative articles on various programming topics.

People also ask about Python Paramiko Fails to Authenticate Password: SSH/SFTP Client Works

  • Why is Python Paramiko failing to authenticate my password?
  • How can I troubleshoot authentication issues with Python Paramiko?
  • Is there a workaround for Python Paramiko authentication failures?
  1. One possible reason for Python Paramiko failing to authenticate your password is that the remote server is not configured to accept password authentication. In this case, you may need to use a different authentication method, such as public key authentication.
  2. To troubleshoot authentication issues with Python Paramiko, you can try enabling verbose logging and examining the output for any error messages or clues as to what might be causing the problem. You can also try manually connecting to the remote server using a standard SSH client to see if you are able to authenticate successfully.
  3. If you are unable to resolve authentication issues with Python Paramiko, you may want to consider using a different library or tool for your SSH/SFTP needs. Some alternatives include `ssh2-python`, `fabric`, and `paramiko-expect`.