Your achievements

Level 1

0% to

Level 2

Tip /
Sign in

Sign in to Community

to gain points, level up, and earn exciting badges like the new
Bedrock Mission!

Learn more

View all

Sign in to view all badges

The 4th edition of the Campaign Community Lens newsletter is out now!

File transfer error: Unsupported protocol


Level 5

Hello everybody,

I've just configured an SFTP external account and I would like to test the connection.

For this reason I made a simple workflow with a File transfer using that SFTP.

When I run it, I received this error:


Unsupported protocol

CRL-290002 Download error in cURL

SFTP protocol set is 22 so I guess the issue is another.

Could you help me with this problem?

Thanks in advance,


vipul vaibhav


Ananya Kuthiala


6 Replies



Hi salvdangelo

If the sftp is mounted on the same application server then you should use the file collector activity to download the file in a workflow.


Ananya Kuthiala


Level 5

Hello @Ananya, No, the SFTP location is on Adobe AS. It's an external SFTP so I have to use File Transfer activity. Salvatore


Community Advisor


There is a mistake somewhere.

For SFTP you must use the according SFTP type in the External account settings (in Administration/Platform/External accounts).

So it will generate the sftp:// protocol in the activity logs; you should use the debug log checkbox in the Transfer file activity to verify it.

Please don't mislead with FTP with SSL protocol, ftps://, that is an old way to secure connection but not so secure by now so please forget it; FYI it is managed through External account FTP type, and by selecting SSL security in listbox. But I am quite sure you  must NOT use that way.

Because your logs mention sftps:// wrong syntax, I wonder if you wrote this code by calling JSAPI and not through workflow activity Transfer file ?




Level 5

Hello Jean-Serge Biron

Thank you for your reply.

I confirm you that I configured correctly External Account and File Transfer.
I tried to create a new External Account and now I have this log on File Transfer activity:




Community Advisor

accordind to the log, Your public key authentication key failed