paramiko.SSHException: Error reading SSH protocol banner

python sftp paramiko
masnun picture masnun · Mar 1, 2012 · Viewed 20.4k times · Source

I am using Paramiko and trying to connect to my SFTP server. Here is the code I wrote:

class SFTPUploader:
    def __init__(self, host, username, password, port):
        transport = paramiko.Transport((host, port))
        print transport
        transport.connect(username = username, password = password)
        self.sftp = paramiko.SFTPClient.from_transport(transport)

I can connect to my server from the terminal. This thread didn't help since our scenario is different.

Answer

JimB picture JimB · Mar 7, 2012

That error is generated when paramiko doesn't receive a protocol banner, or the server sends something invalid. If the server is otherwise working correctly, this may be due to some network restrictions.

You can use -vvv as an option to the openssh client to get more information about how it's connecting, and you can get the actual banner easily using netcat or telnet on port 22. The banner should start with 'SSH-', or paramiko will return the above error immediately.

Related questions

Paramiko's SSHClient with SFTP

How I can make SFTP transport through SSHClient on the remote server? I have a local host and two remote hosts. Remote hosts are backup server and web server. I need to find on backup server necessary backup file and …

Read More
Upload files using SFTP in Python, but create directories if path doesn't exist

I want to upload a file on a remote server with Python. I'd like to check beforehand if the remote path is really existing, and if it isn't, to create it. In pseudocode: if(remote_path not exist): create_path(…

Read More
How to list all the folders and files in the directory after connecting through SFTP in Python

I am using Python and trying to connect to SFTP and want to retrieve an XML file from there and need to place it in my local system. Below is the code: import paramiko sftpURL = 'sftp.somewebsite.com' sftpUser = 'user_…

Read More