permanent connection loss after network reconnection

[snakeeater98]

qBittorrent & operating system versions

qBittorrent: 4.5.5
Operating system: QTS 5.1.1.2491
Qt: 6.5.2
Libtorrent: 2.0.9.0

What is the problem?

Whenever my ISP reconnects and VPN therefore as well, qBittorrent does not pick up the new connection.
As Network interface I set my VPN nic and for addresses to bind i used all ipv4 addresses

Steps to reproduce

setup a VPN
configure qbittorrent to use the vpn interface
disconnect from network
connect to network
result -> connection in qbittorrent is permanetly lost

Additional context

No response

Log(s) & preferences file(s)

Edit: i took the logs before enabling the option "Reannounce to all trackers when IP or port changed", it changed nothing.
Also manual "force reannounce" does nothing as well.

[DarkVoyage]

Maybe has connection to #16901, #16947, #18488

[DarkVoyage]

There should be some kind of timeout and cyclical retouch of connection in case it was dead at time of first probe. In fact I've had a problem with Windows VPN (ikev2), but have no problem with SoftEther, qB connects right away, when connection on adapter is alive.

[DeathStalker77]

I have noticed this as well, after upgrading to v4.5x and now to v4.6.0RC2 - if you lose VPN connection, qB does NOT reconnect or re-announce upon re-connection - NOR does manually re-announcing. I have had to close the program and relaunch it.

--- DS

[snakeeater98]

so, what can i do to help with the issue ? what does needs diagnosis mean ?

[luzpaz]

@snakeeater98 help debug the issue, or convince someone who has those skills to debug it?

[snakeeater98]

After following multiple paths to possible solutions i finally think i found out what works for me.
Its more like a workaround than a clean solution.
I just made a script that restarted the qBittorrent service and execute it via crontab every 20 min.
If anyone is interested, for qnap qts os the command is "nohup qpkg_service restart qbittorrent 1>>/dev/null 2>>/dev/null".
(not sure if nohup is required but if yes it comes with the entware-std app from the appstore repository myqnap)

EDIT: THIS IS NOT A SOLUTION, because when restarting the service qbittorrent does not save the downloaded progress...
EDIT2: ... set "Save resume data interval" in qbittorrent to a low value.

[luzpaz]

This is another ticket that is a good candidate for increasing log level for network info