Did you test the SFTP User Alias? The test on the IS should return success. Considering the test is successful on the IS, what is the exact error you are encoutering on designer while invoking ‘pub.client.sftp:login’ ? Login should returnCode=0 and returnMsg=‘Successfully logged in’.
You can additionally increase logging level under Settings - Logging - Server Logger - Default - Integration Server - 0147 SFTP Client.
As I already explain, it’s not the first time I use SFTP and so I know how to test a user Alias on IS and it is works.The only thing which didn"t work is to use pub.client.sftp:login service in designer. But I had no error message. In fact in debug, I can not pass the step whatever on success or on failure. It is like as it is blocked.
I found the issue : in fact the flow service was running in several times in IS so it is blocked by different called.