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FTP Error 503 Bad Sequence Of Commands – Let’s fix it!!

Stuck with the FTP Error 503 Bad Sequence Of Commands? We can help you.

This error occurs when attempting to establish a connection to a server that uses SSL.

At Bobcares, we often get requests from our customers regarding FTP as part of our Server Management Services.

Today, we’ll see the reasons for this error to occur and how our Support Engineers fix it.


Why does FTP error 503 bad sequence of commands shows up?

Many of our customers receive FTP errors like ‘503 bad sequence of commands’ while dealing with FTP servers.

We’ve normally seen this error occurring while uploading or downloading dozens of files at a time. In such cases, the commands don’t execute properly instead throw errors.


How we fix FTP error 503 bad sequence of commands?

Recently, one of our customers approached us with a request that he is getting the error ‘503 bad sequence of commands’ while trying to download a file multiple times.

He also mentioned, he is trying to download the files from a Unix FTP server and the remote server is returning an error like the one shown below:

 ftp error 503 bad sequence of commands

So, our Support Engineers checked in detail and suggested the customer close and reset the FTP connection after each command.

This fixed the problem.

Also, we handled another situation where the customer approached us with the same error. Here, the customer was trying to establish a connection to a server that uses SSL.

But, when checked in detail we found that the client did not initiate an SSL session.

So, we configured the client to initiate an SSL session and this resolved the problem.

Note: Fix may vary depending on the scenario. Here we discussed only a few. Our Engineers are handling many Every day.


[Having trouble with FTP errors? We’ll fix it for you.]



In conclusion, this error may occur due to many reasons. Today, we saw how our Support Engineers find a fix for ‘FTP Error 503 Bad Sequence Of Commands’ in a different scenario.


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