https://bugs.kde.org/show_bug.cgi?id=509189
Bug ID: 509189
Summary: KDEConnect does not work with firewall even though
correct ports are unblocked
Classification: Applications
Product: kdeconnect
Version First 25.08.0
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
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SUMMARY
Hello, ever since upgrading to kdeconnect 25.08.0-2 on Arch Linux, I have been
having a weird issue with my firewall. I have unblocked the correct ports
1714-1764 as documented on the wiki; that is, I have added the kdeconnect
service to my home zone on both of my devices and made sure that the zone is
active. Port 5353 is also unblocked for mdns.
Looking at the traffic in wireshark, I am seeing kdeconnect send mdns packets
from port 5353 to seemingly random ports. These packets get filtered and the
devices fail to recognize each other. I can make it work by unblocking ports in
the 40000-50000 range, but it seems to be a bit unreliable. Everything works
perfectly if I turn off the firewall on at least one device.
STEPS TO REPRODUCE
1. sudo firewall-cmd --permanent --zone=public --add-service=kdeconnect && sudo
firewall-cmd --reload on both machines.
2. Restart both machines, launch KDEConnect.
OBSERVED RESULT
The devices fail to see each other. On one machine, run sudo systemctl stop
firewalld. KDEConnect now works. Packets going to ports in the 40000-50000
range are blocked in wireshark.
EXPECTED RESULT
KDEConnect should work with the kdeconnect service added as per the wiki:
https://userbase.kde.org/KDEConnect#Troubleshooting
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 6.4.4
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2
ADDITIONAL INFORMATION
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