[dolphin] [Bug 509732] New: kio sftp does not perform host dns resolution correctly, possibly due to cache problem

[Yann Salmon]

https://bugs.kde.org/show_bug.cgi?id=509732

            Bug ID: 509732
           Summary: kio sftp does not perform host dns resolution
                    correctly, possibly due to cache problem
    Classification: Applications
           Product: dolphin
      Version First 23.08.5
       Reported In:
          Platform: Kubuntu
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: contact+bugs+kde at yannsalmon.fr
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 185125
  --> https://bugs.kde.org/attachment.cgi?id=185125&action=edit
kioclient log showing problem

SUMMARY

Accessing a sftp host on the LAN by name sometimes fails in Dolphin and
kioclient

STEPS TO REPRODUCE
1. Have a computer with a permanent DHCP lease and a assigned name (ysalm-wifi)
on the router's local DNS config
2. Power it on and also power on another computer (say local)
3. Do things on local, including sshing to ysalm-wifi.
4. Set ysalm-wifi to suspend.
5. Do things on local.
5. Power ysalm-wifi back up.
6. On local, in Dolphin or kioclient, navigate to sftp://ysalm-wifi.


OBSERVED RESULT

Get "No route to host" message.

EXPECTED RESULT

Accessing the host.

SOFTWARE/OS VERSIONS
Operating System: Kubuntu 24.04
KDE Plasma Version: 5.27.12
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13
Kernel Version: 6.14.0-29-generic (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Xeon® CPU E3-1245 v5 @ 3.50GHz
Memory: 31.2 Gio of RAM
Graphics Processor: NVIDIA GeForce GTX 1650/PCIe/SSE2
Manufacturer: Dell Inc.
Product Name: Precision Tower 3620

ADDITIONAL INFORMATION

Remote host is accessible by Dolphin/kioclient when using the IP address.

It is also accessible with ssh or sftp command, and resolvectl query finds it.

** kioclient finds the host again if resolvectl flush-caches is performed. **

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