[kde] [Bug 509961] New: Plasma ignoring it should not use proxy for FTP despite "ftpProxy" environment variable is empty

[Rafael Linux User]

https://bugs.kde.org/show_bug.cgi?id=509961

            Bug ID: 509961
           Summary: Plasma ignoring it should not use proxy for FTP
                    despite "ftpProxy" environment variable is empty
    Classification: I don't know
           Product: kde
      Version First unspecified
       Reported In:
          Platform: openSUSE
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: rafael.linux.user at gmail.com
  Target Milestone: ---

On an Intranet that requires the use of an authenticated proxy to browse the
Internet, Plasma 6 ignores the fact that it should not use a PROXY for FTP,
even though the corresponding variable is left empty in Plasma's proxy
settings.

HTTP(S) browsing from all web browsers works correctly, respecting the
httpProxy and httpsProxy values. The browsers prompt for the username and
password.

However, when I try to access FTP servers from Dolphin or Krusader, Plasma
attempts to use the proxy and eventually fails; that is, it is ignoring
"NO_PROXY=".

This problem appeared with Plasma 6; it did not exist in Plasma 5.

It's not a problem with the system libraries, since I can access via the "ftp"
command from the console and it doesn't try to use the proxy. However, if I use
the "w3m" command to browse URLs with the http(s) protocol, it does ask for a
username and password.

I also add that the pcman-qt file manager accesses FTP servers perfectly
without any issues from trying to use a proxy.

I don't know under which hierarchy to place this bug since "kio-frameworks"
mentions "sftp" but not "ftp", that's why I'm putting it here.

EXPECTED RESULT
To no use proxy when using FTP protocol

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20250714
KDE Plasma Version: 6.4.2
KDE Frameworks Version: 6.16.0
Qt Version: 6.9.1
Kernel Version: 6.15.6-1-default (64-bit)
Graphics Platform: Wayland

ADDITIONAL INFORMATION
Assigned variables in "Proxy settings" in Plasma
ftpProxy=
httpProxy=http://10.160.0.12:3120
httpsProxy=http://10.160.0.12:3120
socksProxy=

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