The Marketing Cloud Enhanced FTP is used as storage to import and export files out of Salesforce Marketing Cloud.
If you see the error message below, there are a couple of things you can take to resolve it:
Response: 503 Invalid sequence of commands (AUTH SSL/TLS required prior to authentication).
Error: Could not connect to server
Add ‘sftp:// to the Host field address
- Find the Host address field in your third-party FTP client.
- Add “s” to the beginning of the ftp:// portion of the address, so that it reads “sftp://.”
Enter the port number in the Port field
- Find the Port Number field in your third-party FTP site.
- Enter 22.