It is a common assumption that while creating a target SFTP connection, a user only needs to have the write access to the directory that we select. This is in line with the official help article that says "The directory you select must have Write permission" However, while it may work for some SFTP clients, it would often lead to errors while testing the connection that leads to an error like "Connection failed. Edit your credentials and try again. SftpException: Permission denied."
In order to resolve this error, it is essential to make sure that the SFTP user also has delete access to the directory that we select. This is because, for testing the SFTP connection including the write permission, the connector framework creates a temporary file and deletes in the parent directory. The delete permission is essentially here as the temporary file needs to be cleaned up. The same applies to other connectors including S3, GCS and Azure.
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