[dolphin] [Bug 451750] New: Can't transfer files in Dolphin with ssh (fish) file transfer dies suddenly.

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=451750

            Bug ID: 451750
           Summary: Can't transfer files in Dolphin with ssh (fish) file
                    transfer dies suddenly.
           Product: dolphin
           Version: 21.12.2
          Platform: Neon Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: ioo+kde at posteo.net
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
Can't transfer files in Dolphin with ssh (fish). The transfer starts then after
a few second, a dialog box appears "Could not write file". This corresponds
with an event in the ssh access log (/var/log/auth.log) on the destination:

Mar 21 00:49:13 server sshd[473651]: Received disconnect from x.x.x.x port
xxxxx:11: disconnected by user
Mar 21 00:49:13 server sshd[473651]: Disconnected from user user x.x.x.x port
xxxxx
Mar 21 00:49:13 server sshd[473392]: pam_unix(sshd:session): session closed for
user user
Mar 21 00:49:13 server systemd-logind[831]: Session 189 logged out. Waiting for
processes to exit.
Mar 21 00:49:13 server systemd-logind[831]: Removed session 189.

This was tested on a variety of different files on a local, wired connection
for both the target and destination.

Also, there is a second problem. The speed for transferring a file 20x slower
than scp. With scp the speed is is 20MB/s. With Dolphin sshfs (fish), it is
1.15MB/s. This speed is not useful.

STEPS TO REPRODUCE
1. Create a fish connection in Dolphin.
2. open two tabs in Dolphin, one local tab containing the file to be copied and
one remote tab.
3. drag the file from the local tab to the remote tab.
4. Observe that the file transfer starts then after a few second stops with the
error reported above.

OBSERVED RESULT
Files can't be transferred, the transfer is always terminated.

EXPECTED RESULT
The file transfer should just complete. scp and sftp not using Dolphin work as
expected. Dolphin sshfs does not work.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.24.1
(available in About System)
KDE Plasma Version: 5.24.1
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION
Even if the disconnect issue is solved, the slow speed is still way too slow to
be used. Please consider there are two issues in this issue report.

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