KDE Connect Broken After 7.1.9 Upgrade (7.1.10 still broken)

[williamrw]

Hello,
I am experiencing an issue where KDE Connect has stopped working entirely following recent kernel updates on siduction.
Problem Description:
KDE Connect was working perfectly until I updated the system. The break initially occurred immediately after upgrading to kernel version 7.1.9. Upgrading further to 7.1.10 did not resolve the issue; KDE Connect remains non-functional (it cannot detect or pair with any devices on the same local network).
Environment:

• OS: siduction (unstable)
• Desktop Environment: KDE Plasma
• Working Kernel: 7.1.8
• Broken Kernels: 7.1.9-1-siduction-amd64 and 7.1.10-1-siduction-amd64

Steps to Reproduce:

• Boot into siduction using kernel 7.1.9 or 7.1.10.
• Open KDE Connect.
• Attempt to refresh or find previously paired local network devices (e.g., Android phone).
• Notice that no devices appear, and communication fails.

Troubleshooting Done:

• • Confirmed both devices are on the exact same Wi-Fi network.
  • Swapping back to an older kernel temporarily fixes the issue, which isolates the problem to the 7.1.9+ kernel updates.

Thank you for looking into this![/list]

williamrw@williamrw-asussid:~$ uname -a
 Linux williamrw-asussid 7.1.10-1-siduction-amd64 #1 SMP PREEMPT_DYNAMIC siduction 7.1-10 (2026-08-23) x86_64 GNU/Linux
 williamrw@williamrw-asussid:~$ ps -ef | grep kdeconnect
 william+    2430    1973  0 11:09 ?        00:00:00 /usr/bin/kdeconnectd
 william+    3510    3496  0 11:12 pts/1    00:00:00 grep kdeconnect
 williamrw@williamrw-asussid:~$ journalctl -b --user -u kdeconnect
 -- No entries --
 williamrw@williamrw-asussid:~$ inxi -Fz
 System:
  Kernel: 7.1.10-1-siduction-amd64 arch: x86_64 bits: 64
  Desktop: KDE Plasma v: 6.7.4 Distro: siduction 2025.1.0 shine-on - kde -
    (202503241412)
 Machine:
  Type: Laptop System: ASUSTeK product: ASUS TUF Gaming F16 FX608JHR_FX608JHR
    v: 1.0 serial: <superuser required>
  Mobo: ASUSTeK model: FX608JHR v: 1.0 serial: <superuser required>
    Firmware: UEFI vendor: American Megatrends LLC. v: FX608JHR.312
    date: 05/07/2026
 Battery:
  ID-1: BAT0 charge: 71.5 Wh (83%) condition: 86.2/90 Wh (95.7%)
 CPU:
  Info: 16-core (8-mt/8-st) model: Intel Core i7-14650HX bits: 64
    type: MST AMCP cache: L2: 24 MiB
  Speed (MHz): avg: 800 min/max: 800/5000:5200:3700 cores: 1: 800 2: 800
    3: 800 4: 800 5: 800 6: 800 7: 800 8: 800 9: 800 10: 800 11: 800 12: 800
    13: 800 14: 800 15: 800 16: 800 17: 800 18: 800 19: 800 20: 800 21: 800
    22: 800 23: 800 24: 800
 Graphics:
  Device-1: Intel Raptor Lake-S UHD Graphics driver: i915 v: kernel
  Device-2: NVIDIA GB207M [GeForce RTX 5050 Max-Q / Mobile] driver: nvidia
    v: 580.178.04
  Device-3: Shinetech ASUS FHD webcam driver: uvcvideo type: USB
  Display: wayland server: X.org v: 1.21.1.24 with: Xwayland v: 24.1.13
    compositor: kwin_wayland driver: X: loaded: modesetting,nvidia
    unloaded: fbdev,nouveau,vesa dri: iris gpu: i915
    resolution: 1920x1200~165Hz
  API: EGL v: 1.5 drivers: iris,nvidia,swrast
    platforms: gbm,wayland,x11,surfaceless,device
  API: OpenGL v: 4.6.0 compat-v: 4.6 vendor: intel mesa v: 26.1.6-1
    renderer: Mesa Intel Graphics (RPL-S)
  API: Vulkan v: 1.4.357 drivers: intel,nvidia,llvmpipe surfaces: N/A
  Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
    de: kscreen-console,kscreen-doctor gpu: nvidia-smi wl: wayland-info
    x11: xdriinfo, xdpyinfo, xprop, xrandr
 Audio:
  Device-1: Intel 700 Series Family HD Audio driver: snd_hda_intel
  Device-2: NVIDIA GB207 High Definition Audio driver: snd_hda_intel
  API: ALSA v: k7.1.10-1-siduction-amd64 status: kernel-api
  Server-1: PipeWire v: 1.6.8 status: active
 Network:
  Device-1: Realtek RTL8852CE PCIe 802.11ax Wireless Network
    driver: rtw89_8852ce
  IF: wlan0 state: up mac: <filter>
  Device-2: Realtek RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet
    driver: r8169
  IF: enp109s0 state: down mac: <filter>
  Device-3: Realtek RTL8153 Gigabit Ethernet Adapter driver: r8152 type: USB
  IF: enx00e04cadb005 state: down mac: <filter>
 Bluetooth:
  Device-1: IMC Networks Bluetooth Radio driver: btusb type: USB
  Report: hciconfig ID: hci0 state: up address: <filter> bt-v: 5.3
 Drives:
  Local Storage: total: 8.67 TiB used: 1.72 TiB (19.9%)
  ID-1: /dev/nvme0n1 vendor: Western Digital model: WD Green SN3000 1TB
    size: 931.51 GiB
  ID-2: /dev/nvme1n1 vendor: Corsair model: MP600 MICRO size: 931.51 GiB
  ID-3: /dev/nvme2n1 vendor: Western Digital model: WD Blue SN5000 2TB
    size: 1.82 TiB
  ID-4: /dev/nvme3n1 vendor: Lexar model: SSD NQ780 1TB size: 953.87 GiB
  ID-5: /dev/nvme4n1 vendor: Western Digital model: WD BLACK SN850X 1000GB
    size: 931.51 GiB
  ID-6: /dev/sda model: XS1000 size: 1.82 TiB type: USB
  ID-7: /dev/sdb vendor: Kingston model: SNV3S1000G size: 931.51 GiB
    type: USB
  ID-8: /dev/sdc vendor: Eaget model: N/A size: 476.94 GiB type: USB
 Partition:
  ID-1: / size: 931.22 GiB used: 55.33 GiB (5.9%) fs: btrfs
    dev: /dev/nvme1n1p2
  ID-2: /boot/efi size: 299.4 MiB used: 640 KiB (0.2%) fs: vfat
    dev: /dev/nvme1n1p1
  ID-3: /home size: 931.22 GiB used: 55.33 GiB (5.9%) fs: btrfs
    dev: /dev/nvme1n1p2
  ID-4: /var/log size: 931.22 GiB used: 55.33 GiB (5.9%) fs: btrfs
    dev: /dev/nvme1n1p2
 Swap:
  Alert: No swap data was found.
 Sensors:
  System Temperatures: cpu: 45.2 C mobo: N/A
  Fan Speeds (rpm): cpu: 2400
 Info:
  Memory: total: 32 GiB note: est. available: 30.94 GiB used: 3.62 GiB (11.7%)
  Processes: 535 Uptime: 13m Shell: Bash inxi: 3.3.41
 
 

[Teriarch]

Can you provide the output of the following commands with reachable
devices around:

Code Select Expand

$ uname -a
Linux arlene 7.1.10-1-siduction-amd64 #1 SMP PREEMPT_DYNAMIC siduction 7.1-10 (2026-08-23) x86_64 GNU/Linux
$ kdeconnect-cli -l
- Pixel 3: 3a89574d70d841988b3a1a660c29d56d (paired)
- CUBOT H3: 51d02e19631c4bd282e9e61ba7a89599 on 192.168.178.58 via LAN (paired and reachable)
- Pixel 3: 99fd3e01d219433f87d368e21f31faf0 (paired)
3 devices found
$ ps xa|grep kdeconnect
  3116 ?        Sl    0:00 /usr/bin/kdeconnectd
  4709 ?        Sl    0:00 kdeconnect-indicator
  19389 ?        S    0:00 /usr/lib/x86_64-linux-gnu/libexec/kf6/kioworker /usr/lib/x86_64-linux-gnu/qt6/plugins/kf6/kio/tags.so tags  local:/run/user/1000/kdeconnect.daemonmAfdLg.3.kioworker.socketIt seems to be a local problem. Pinging the device also works with siduction kernel
7.1.10-1-siduction-amd64:

Code Select Expand

$ kdeconnect-cli --ping -d 51d02e19631c4bd282e9e61ba7a89599PS.:
The only relevant change to the 7.1.9 kernel relating to this issue is
the FIB support of nftables (see <https://forum.siduction.org/index.php?topic=10020.0>).
So I suspect some hidden firewall rule might be responsible for the blocking
of TCP/UDP port 1716 on which /usr/bin/kdeconnctd runs.

[hendrikL]

Well, I used to have the same problem.

I investigate spare time to, hopefully, solve it.

In short, the culprit is firewalld.

: https://userbase.kde.org/KDEConnect#firewalld

[...]

If your firewall is firewalld, you can open the necessary ports with:

sudo firewall-cmd --permanent --zone=home --add-service=kdeconnect
sudo firewall-cmd --reload

Note
This allows KDE Connect to be accessed from outside while you're in the "home" zone. A zone can be assigned to your WiFi connection in network settings. For safety, you should rather avoid running KDE Connect in "public" zone.

But it doesn't work because the home-zone wasn't active.

Code Select Expand

# firewall-cmd --get-active-zones
docker
  interfaces: docker0
libvirt
  interfaces: virbr0
public (default
  interfaces: wlan0

No home zone active!

So I had to activate that zone to get it working.

Code Select Expand

firewall-cmd --permanent --zone=home --change-interface=wlan0
I am using a laptop connected via Wi-Fi/wlan0 to the Network/Internet.

Code Select Expand

# firewall-cmd --get-active-zones
docker
  interfaces: docker0
home
  interfaces: wlan0
libvirt
  interfaces: virbr0
public (default)

Don't forget to reload firewalld.

Here is my home.xml

Code Select Expand

# cat /etc/firewalld/zones/home.xml
<?xml version="1.0" encoding="utf-8"?>
<zone>
  <short>Home</short>
  <description>For use in home areas. You mostly trust the other computers on networks to not harm your computer. Only selected incoming connections are accepted.</description>
  <service name="ssh"/>
  <service name="mdns"/>
  <service name="samba-client"/>
  <service name="dhcpv6-client"/>
  <service name="kdeconnect"/>
  <masquerade/>
  <forward/>
</zone>


[hendrikL]

I moved it to upgrade-warnings, it could affect other systems too!

[williamrw]

Problem: After upgrading to kernel 7.1.9 and through 7.2.2 phone was not reachable:
Solution below:

KDE Connect is now working correctly on kernel 7.2.2. ✅
My final result:

OnePlus 13: 08d76a1981a644199b60068898c92814
on 192.168.1.19 via LAN (reachable)
1 device found

And the permanent firewalld configuration is:

home zone
1716/tcp
1716/udp

Final diagnosis
The kernel upgrade itself wasn't breaking KDE Connect. The problem was that after the upgrade, my firewalld home zone no longer allowed KDE Connect's port 1716.
The decisive test was:

Phone → 192.168.1.16:1716 TCP SYN
with no SYN-ACK.


After adding:

firewall-cmd --permanent --zone=home --add-port=1716/tcp
firewall-cmd --permanent --zone=home --add-port=1716/udp
the phone immediately became:

via LAN (reachable)