Timeout error due to Error reading SSH protocol banner

Question

Timeout error due to Error reading SSH protocol banner

Abhilasha Kumar 0

Hi Team,

We are facing ‘Timeout error due to Error reading SSH protocol banner’ while trying to connect to sftp server through Azure Synapse Notebook. We are using python as source language and paramiko version 2.12.0 to connect to the server and download the data. This error is thrown randomly on Azure Notebook. Please see the below screenshot of error for your reference.

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Can you please help for this.

Regards,

Abhilasha

Chandra Boorla 14,585 Reputation points Microsoft External Staff Moderator

2024-11-06T00:58:25.86+00:00

Hi @Abhilasha Kumar

Following up to see if the below answer was helpful. If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Thank you.

1 answer

Your answer

Chandra Boorla 14,585 Reputation points Microsoft External Staff Moderator

2024-11-06T00:58:25.86+00:00

Hi @Abhilasha Kumar

Following up to see if the below answer was helpful. If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Thank you.

Answer 1

Chandra Boorla 14,585 Microsoft External Staff Moderator

Hi @Abhilasha Kumar

Greetings & Welcome to Microsoft Q&A forum! Thanks for posting your query!

It seems that you are facing an error while working with Azure Synapse Notebook. The error message "paramiko.ssh_exception.SSHExeception: Error reading SSH protocol banner" usually occurs when the SSH banner is not being read correctly. This can happen due to various reasons such as network connectivity issues, incorrect SSH configuration, or firewall restrictions.

Here are some troubleshooting steps that might help you in resolving your query.

Network Connectivity - Verify that you can reach the SSH server from your Azure Synapse environment. You can do this by using tools like ping or telnet to ensure that the server is reachable on the SSH port (default is port 22).
Firewall and Security Groups - Ensure that there are no firewalls or security groups blocking the SSH traffic. Check both the inbound and outbound rules to make sure that port 22 is open.
Server Configuration - Make sure that the SSH server is running and properly configured. You can check the SSH server logs for any errors or warnings that might provide more insight.
Update Paramiko - Ensure that you are using the latest version of Paramiko, as bugs and issues are fixed in newer releases. You can update Paramiko using pip:

pip install --upgrade paramiko

For your reference, the following links may provide some useful insights.

https://stackoverflow.com/questions/65005579/error-reading-ssh-protocol-banner-when-connecting-to-port-443-with-paramiko-in

https://dnmtechs.com/paramiko-error-reading-ssh-protocol-banner-in-python-3-programming/

Disclaimer: This response contains a reference to a third-party World Wide Web site. Microsoft is providing this information as a convenience to you. Microsoft does not control these sites and has not tested any software or information found on these sites; therefore, Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. There are inherent dangers in the use of any software found on the Internet, and Microsoft cautions you to make sure that you completely understand the risk before retrieving any software from the Internet.

I hope this information helps. Please do let us know if you have any further queries.

If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Chandra Boorla 14,585 Reputation points Microsoft External Staff Moderator

2024-11-07T06:24:15.7433333+00:00

Hi @Abhilasha Kumar

Following up to see if the above answer was helpful. If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.
Abhilasha Kumar 0 Reputation points

2024-11-08T12:17:39.25+00:00

Hi,

We did faced the same error again and as mentioned we tried the telnet command and it is working but still we are facing connection timed out error while connecting to the server.

Please see the below screenshot of telnet command.
Abhilasha Kumar 0 Reputation points

2024-11-08T12:21:31.1733333+00:00

Hi,

We did tried to telnet the ip and it was successful but we are still facing the connection timed out error while trying to connect to the sftp server.

Also I tried ssh command to check the connectivity of server but the command is running continuously and gives no output

Please see the below screenshot of telnet and ssh command output.
Abhilasha Kumar 0 Reputation points

2024-11-08T13:50:20.9633333+00:00

Hi,

We did tried to telnet the ip and it was successful but we are still facing the connection timed out error while trying to connect to the sftp server.

Also I tried ssh command to check the connectivity of server but the command is running continuously and gives no output

Please see the below screenshot of telnet and ssh command output.
Abhilasha Kumar 0 Reputation points

2024-11-11T12:37:15.22+00:00

Hi @Chandra Boorla I just checked today, and was able to connect to the server without facing 'Connection TimedOut' error . When I tried ping and ssh command, I am able to get the result and both the commands finish on time and does not run continuously like it happens when we face the 'Connection TimedOut error.

Please see the below screenshot of telnet and ssh commands.
Chandra Boorla 14,585 Reputation points Microsoft External Staff Moderator

2024-11-11T13:29:41.2233333+00:00

@Abhilasha Kumar

Apologies for the delay in response from my end.

Glad that you are able to connect to the server without facing 'Connection TimedOut error' and good to hear that both the commands finished on time and does not run continuously like it happens when you got the 'Connection TimedOut error' and able to get the result as expected.

In case if you have any resolution, please do share that same with the community as it can be helpful to others.

Please do let us know if you have any further queries.

Thank you.
Abhilasha Kumar 0 Reputation points

2024-11-12T05:25:41.9833333+00:00

@Chandra Boorla I believe you did not see the old comments. When we are facing 'Connection Timed Out' error, both telnet and ssh commands run continuously while when we are not facing this error both commands gives the desired output in time. Can you please help on why this is happening.

Thanks you.
Abhilasha Kumar 0 Reputation points

2024-11-13T05:52:54.6733333+00:00

@Chandra Boorla Any update on this
Chandra Boorla 14,585 Reputation points Microsoft External Staff Moderator

2024-11-13T07:14:45.49+00:00

@Abhilasha Kumar

Apologies for the inconvenience.

I agree that this issue looks strange, and I wasn't able to reproduce this issue. If you have a support plan, could you please file a support ticket for deeper investigation and do share the SR# with us?

Thank you.
Chandra Boorla 14,585 Reputation points Microsoft External Staff Moderator

2024-11-14T01:46:14.1433333+00:00

@Abhilasha Kumar

We haven’t heard from you on the last response and was just checking back to see if you've had a chance to submit a support ticket. If you have, a reference to the ticket number would be greatly appreciated. This will allow us to track the progress of your request and ensure you receive the most efficient support possible.

Thank you.

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Timeout error due to Error reading SSH protocol banner

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