FTP connection error

clueless_2:

proably configured to not respond.

clueless_2:

not a firewall issue because other hosts work, other ftp clients work, and tested w/ firewall off

Hold on. I’m confused now. In your first message, you wrote:

clueless_2:

tried other FTP clients, same issue.

Does the issue happen with only one particular FTP client or not?

And if it does only happen with one FTP client: which FTP client is it, and how important is it that you can use that specific one?

clueless_2:

• ftpupload.net FUBAR, needs fixed
• ftp.infinityfree.com and 185.27.134.11 also need fix or reconfigure
• use ftp.epizy.com as an alternate until ftpupload.net is fixed

ftp.epizy.com also resolves to 185.27.134.11. They are all literally the same FTP server with the same IP address. And the fact that ftpupload.net is resolving to the correct IP address for you proves that it’s not a DNS level blocking issue (which does happen, and that’s when we recommend using the alternative hostnames).

Which makes ftp.epizy.com working for you but ftpupload.net not working all the more strange.

Also, our servers only support FTP with (optional) Explicit TLS. Don’t bother trying implicit TLS or any protocols that are not FTP (SSH/SFTP/SCP/Rsync/Webdav/etc.), those won’t work.

So your investigation has told me a few things:

• It’s not a DNS level block.
• The error you see is not something you recognize as an auth error.
• The issue doesn’t happen all the time.

It’s progress, but I still don’t have enough information to really understand what’s going wrong.

So, like I asked before, can you please provide the full connection log so we can see what actually happens instead of having to rely on your own conclusions?

How to get full logs from FileZilla File Management and FTP

When trying to debug issues with FTP connections, it’s very useful to know what an FTP client is doing under the hood. FileZilla is a very popular FTP client which can provide fairly detailed information about it’s connections. This article explains how to get this information. Enable debug logging To enable debug logging in FileZilla, you’ll need to do the following: Go to Edit → Settings… Scroll down to the Debug page. Ensure that “Show debug menu” is enabled (it is by default). Update the…