Bug 502409

Same is happening to me, KSystemLog is showing the following everytime I refresh the devices list:

2025-04-06 16:30	kdeconnectd	2025-04-06T16:30:31 kdeconnect.core: Invalid identity packet received
2025-04-06 16:30	kdeconnectd	2025-04-06T16:30:32 kdeconnect.core: Invalid identity packet received
2025-04-06 16:30	kdeconnectd	2025-04-06T16:30:32 kdeconnect.core: LanLinkProvider/newConnection: Host timed out without sending any identity. QHostAddress("::ffff:192.168.0.25")
2025-04-06 1:30	kdeconnectd	2025-04-06T16:30:33 kdeconnect.core: LanLinkProvider/newConnection: Host timed out without sending any identity. QHostAddress("::ffff:192.168.0.25")

SOFTWARE/OS VERSIONS
Operating System: openSUSE Leap 15.6
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.12.0
Qt Version: 6.9.0
Kernel Version: 6.4.0-150600.23.42-default (64-bit)
Graphics Platform: Wayland

Smartphone KDE Connect version: FDroid 1.33.2

KDE Connect: 25.03.90
openSUSE Leap 15.6 (Wayland)
KDE Frameworks: 6.12.0
Qt: Using 6.9.0 and built against 6.9.0
Build ABI: x86_64-little_endian-lp64
Kernel: linux 6.4.0-150600.23.42-default

Interestingly, on NixOS nightly, using GNOME with GSConnect, I am able to connect to my phone. So, I think the issue lies with KDE Connect on Linux.

(In reply to Claudio from comment #0)
> SUMMARY
> After upgrading to KDE Connect 25.03.90 the desktop app can no longer see my
> Android devices and the other way around (Android APP version 1.33.2 from
> Google Play store).
> 
> STEPS TO REPRODUCE
> 1. Upgrade to 25.03.90
> 2. Reboot
> 
> OBSERVED RESULT
> KJournald shows:
> 
> kdeconnect.core: Invalid identity packet received
> kdeconnect.core: LanLinkProvider/newConnection: Host timed out without
> sending any identity. QHostAddress("::ffff:XXX")
> 
> XXX= IPv4 of Android device
> Disabling firewalld completely didn't help
> 
> EXPECTED RESULT
> KDE Connect still working (downgrading only the kdeconnect package 24.12.3
> and restarting the service makes everything work again)
> 
> SOFTWARE/OS VERSIONS
> Operating System: EndeavourOS 
> KDE Plasma Version: 6.3.4
> KDE Frameworks Version: 6.12.0
> Qt Version: 6.9.0
> Kernel Version: 6.14.0-arch1-1 (64-bit)
> Graphics Platform: Wayland
> Processors: 32 × AMD Ryzen 9 5950X 16-Core Processor
> Memory: 125.7 GiB of RAM
> Graphics Processor: AMD Radeon RX 7800 XT
> Manufacturer: Micro-Star International Co., Ltd.
> Product Name: MS-7D50
> System Version: 1.0
> 
> ADDITIONAL INFORMATION

Hey! I have just found the solution!

Have added the bug report that helped me out, see above under "See Also:".

There, the last comment reads:
> there are two main reasons that can cause this -and related issues-:
> - you are not running an updated desktop version 25.xx.xx (protocol mismatch)
> - or you -initially- installed an android version older than 1.24.x (short
> device-id)
> 
> solutions:
> - for the first, if you can't upgrade the desktop version, you must
> downgrade the android version below 1.33.x, a protocol version change made
> untrusted devices not visible.
> - for the second, the device-id auto-generated by android is too short (< 32
> chars) and the newer protocol doesn't support it, you can check this by
> looking up your device on ~/.config/kdeconnnect/trusted_devices, the section
> name is your device-id. if this is the case you need to delete your app data
> and pair again your device. after that you _might_ upgrade your android
> version.
> 
> 
> some of this info was taken from github.com/metallkopf/konnect

For me, clearing storage and cache on KDE Connect on my cellphone fixed the issue.

*** This bug has been marked as a duplicate of bug 501635 ***

(In reply to Eliseu Amaro from comment #3)
> Have added the bug report that helped me out, see above under "See Also:".
> 
> There, the last comment reads:
> > there are two main reasons that can cause this -and related issues-:
> > - you are not running an updated desktop version 25.xx.xx (protocol mismatch)
> > - or you -initially- installed an android version older than 1.24.x (short
> > device-id)
> > 
> > solutions:
> > - for the first, if you can't upgrade the desktop version, you must
> > downgrade the android version below 1.33.x, a protocol version change made
> > untrusted devices not visible.
> > - for the second, the device-id auto-generated by android is too short (< 32
> > chars) and the newer protocol doesn't support it, you can check this by
> > looking up your device on ~/.config/kdeconnnect/trusted_devices, the section
> > name is your device-id. if this is the case you need to delete your app data
> > and pair again your device. after that you _might_ upgrade your android
> > version.
> > 
> > 
> > some of this info was taken from github.com/metallkopf/konnect
> 
> For me, clearing storage and cache on KDE Connect on my cellphone fixed the
> issue.

Yep - clearing storage on the Android APP helped also for me - Thanks :)