Error 503 Bad Sequence – Causes and Fixes

Contents

Bad sequence of commands. This error can be normally seen during the upload and download of multiple files.

Causes

Command sequence wrongly

For instance, a file rename requires a successful RNFR command before the RNTO command can be sent, sending the RNTO command first will result in Error 503

Step 1: Verify Command

Verify command sequence.

Updated on June 23, 2020