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Operating System: Kubuntu 24.04
KDE Plasma Version: 5.27.12
Qt Version: 5.15.13
Graphics Platform: X11

I'm unable to connect to a remote FTP server using dolphin or krusader. When I try, I get "unable to connect to localhost."

ftp://[email protected] or ftp://[email protected]

Both fail with the same error.

The remote FTP server is running. The appropriate firewall ports are open. My IP address is whitelisted. Most importantly: I can connect without issue from the command line, like so:

:~$ ftp [email protected]

I've tried

sudo resolvectl flush-caches

but that didn't help. I was connected yesterday (and days previous) without issue. Google and ChatGPT are no help. How can I fix this issue?

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    The IP Address you quote is invalid. ftp://[email protected]. Edit your Question and show host remote.ftp.server (an invalid hostname), sudo traceroute remote.ftp.server, ip route. Install the tracepath utility, part of the iputils package, and for port in 20 21 ; do tracepath remote.ftp.server $port ;done Commented Sep 1, 2025 at 20:37
  • ChatGPT and Google search the whole internet, not just the parts that make sense. Commented Sep 1, 2025 at 20:41
  • What error does it fail with? How do you connect from the command line? Commented Sep 2, 2025 at 5:07
  • 1
    I can connect without issue from the command line : Could you edit your message to indicate the command you are running? Commented Sep 2, 2025 at 9:23

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