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The FTP connection was denied by the remote server. Not much you can do about it, I'm afraid.

Due to the way PHP handles FTP uploads we need to create a new FTP connection to the remote server for each file being uploaded there by the DirectFTP engine. Once the upload is complete the connection is closed. This is repeated for every file being backed up.

Many FTP servers have a limit on the number of connections any given IP or user can have in a period of time. If you exceed that limit they start refusing connections. This makes sense, since starting an FTP connection is actually quite resource intensive. This is also why uploading lots of small files by FTP (like DirectFTP does) is painfully slow.

A better approach is to back up to a JPA, JPS or ZIP file with a part size for split archives around 5 to 10M. Use the Upload to FTP post-processing engine with the "upload files immediately" option to upload each generated archive part as soon as it's ready. This results in far fewer uploads of much bigger files which is better for backup performance (faster backups) and unlikely to result in the FTP uploads being blocked. You can also use the "upload kickstart" feature found in the Configuration page to also upload kickstart.php to the target site which allows you to extract the backup really fast.

Alternatively, take a regular JPA backup and use the Site Transfer Wizard to upload it to the remote server. It essentially does the same thing with a small twist: it will only use FTP to upload a special version of "unattended Kickstart". Then it will use this "unattended Kickstart" to upload the backup archive in 1M chunks over regular HTTP/HTTPS (therefore sidestepping the FTP upload limits) and automatically extract the backup on the target server. All you have to do is go through the restoration script's (ANGIE) steps to restore the site on the remote server.

I hope this information helps!

I can tell you what has NOT changed: the DirectFTP engine which has not been touched in years :) Also, since you are managing your own server you should have the knowledge required to look at the necessary logs on the server under your absolute control and see what the server under your absolute control that you have set up and you are managing has started denying the FTP connections at some point. Based on your log file, as I already told you, we see that it's your FTP server which is blocking the connection after a while (we've already uploaded several dozen files since we're well past uploading the installation folder and into the backup of the rest of the site). So, no connection problem on the side of the backup software.

No problem :) I'll leave this ticket open in case you need me to help you on something.