ADF error in linked service : client requested SFTP protocol version 4, but we can only support protocol version 3 due to lack of UTF8 support

Question

ADF error in linked service : client requested SFTP protocol version 4, but we can only support protocol version 3 due to lack of UTF8 support

palla sruthi 0

We are trying to connect to an external SFTP system from ADF which is on On-premise and getting below error, the connection was working until recent but failing now with below error

client requested SFTP protocol version 4, but we can only support protocol version 3 due to lack of UTF8 support (requires --enable-nls) 2024-11-06 02:45:04,017 mod_sftp/1.1.1[995646]: using SFTP protocol version 3 for this session (channel ID 0) 2024-11-06 02:45:04,031 mod_sftp/1.1.1[995646]: empty path given in REALPATH request, using '/' 2024-11-06 02:45:04,203 mod_sftp/1.1.1[995646]: client at ******** sent SSH_DISCONNECT message: The user disconnected the application (Application disconnected)

phemanth 14,800 Reputation points Microsoft External Staff

2024-12-05T20:04:15.92+00:00

@palla sruthi We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
phemanth 14,800 Reputation points Microsoft External Staff

2024-12-09T16:33:17.09+00:00

@palla sruthi was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
palla sruthi 0 Reputation points

2024-12-11T14:35:30+00:00

@phemanth The On-Premise system is not ready to make any changes , and the issue is still not resolved

1 answer

Your answer

phemanth 14,800 Reputation points Microsoft External Staff

2024-12-05T20:04:15.92+00:00

@palla sruthi We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
phemanth 14,800 Reputation points Microsoft External Staff

2024-12-09T16:33:17.09+00:00

@palla sruthi was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
palla sruthi 0 Reputation points

2024-12-11T14:35:30+00:00

@phemanth The On-Premise system is not ready to make any changes , and the issue is still not resolved

Answer 1

phemanth 14,800 Microsoft External Staff

@palla sruthi

Thanks for reaching out to Microsoft Q&A.

It looks like you’re encountering an issue with the SFTP protocol version compatibility in Azure Data Factory (ADF).

steps you can take to troubleshoot and resolve this issue:

Check SFTP Server Configuration: Ensure that the SFTP server supports the required protocol version. Since ADF supports SFTP protocol version 3, you might need to configure the SFTP server to use this version.
Enable UTF-8 Support: The error message indicates a lack of UTF-8 support. You might need to enable UTF-8 support on the SFTP server. This can typically be done by configuring the server settings to include --enable-nls.
Update ADF Linked Service: Verify the configuration of your ADF linked service. Ensure that all settings, including authentication and port configuration, are correctly specified. You might also want to check if there have been any recent changes to the SFTP server settings that could affect the connection.

Refer to the Azure Data Factory documentation for detailed guidance on configuring SFTP connections and troubleshooting .

Hope this helps. Do let us know if you any further queries.

phemanth 14,800 Reputation points Microsoft External Staff

2024-12-13T16:46:18.1666667+00:00
@palla sruthi

Please consider below approaches and let us know

Use an Intermediate SFTP Server: Set up an intermediate SFTP server that supports both protocol versions. You can transfer files from the on-premise system to this intermediate server using SFTP protocol version 4, and then connect ADF to this intermediate server using protocol version 3.

Custom Integration Runtime: If you haven’t already, consider using a self-hosted integration runtime (SHIR) in Azure Data Factory. This can sometimes provide more flexibility in handling specific protocol requirements and configurations.

Azure Logic Apps: Use Azure Logic Apps as an intermediary to handle the file transfer. Logic Apps can connect to various systems and might offer more flexibility in terms of protocol support and transformations.

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ADF error in linked service : client requested SFTP protocol version 4, but we can only support protocol version 3 due to lack of UTF8 support

1 answer

Your answer