With no intentional changes, qBittorrent is now Connection Status: offline continuously

Windows specific questions, problems.
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VulcanTourist
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Joined: Tue Sep 14, 2021 3:17 am

With no intentional changes, qBittorrent is now Connection Status: offline continuously

Post by VulcanTourist »

I'm using qBitttorrent v4.3.8. With no intentional changes to it or networking, it has suddenly stopped working, continuously showing Connection Status: offline. I fired up uTorrent, which I haven't used in 2 years, and it happily began trying to download leftover torrents. My last use of uTorrent even preceded my use of a VPN, and it didn't mind the addition in the least.

Since uTorrent always used a different and fixed port, I changed qBittorrent to match that port; there was no change. Disabled the Windows 10 Defender Firewall; no change. Changed VPN servers (support torrents); no change. It's now been days with qBittorrent offline and me none the wiser.

I'm stumped what changed. How do I troubleshoot the cause?
VulcanTourist
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Posts: 2
Joined: Tue Sep 14, 2021 3:17 am

Re: With no intentional changes, qBittorrent is now Connection Status: offline continuously

Post by VulcanTourist »

I solved my own problem: my VPN's local client application updated, and it silently created a new iterated network interface and invalidated the prior one. It of course had the same user-facing name, but internally to Windows it had an incremented identifier. This in turn confused qBittorrent, which under Advanced | Network Interface then showed TWO interfaces of the same name! After selecting Any Interface, confirming that was functional, then restarting qBt and checking again, I was able to cause qBt to refresh the list, and the duplicate entry disappeared. I was finally able to select the interface of the same apparent name for the VPN again and qBt is back to normal function.

Part of the blame for this rests with qBittorrent, which could employ a little more intelligence when it comes to identifying "updated" network interfaces in such situations. At least I now know to expect to be forced to work around this interface literalism the next time it happens.
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