Cert error when trying to access torrent trackers, causing problems with Jackett

[LeVraiRoiDHyrule]

On my PC, I can perfectly access all these trackers, so I think I can exclude the router ?

Coming back to that, now that we have pinpointed the culprit.
It is possible that your PC is using other nameservers, without any configuration from your part. For example browsers now support DNS over HTTPS. Or at some point you added some additional nameserver, like GoogleDNS.
The fact of the matter is that your ISP seems to be blocking on DNS level certain sites. You could try to resolve other torrent or possibly banned hostnames to verify that using your ISP router as the resolver.

Hi,

Thanks a lot for your answer.
Ok so now we know where the problem is.

But what is strange is that my ISP is not supposed to block any website (mine is known to let everything pass). Plus, I am using Cloudflare DNS on my Pi, so even if it were blocking sites, it should still work because of Cloudflare, right ?

I can’t find any torrent tracker that is known to be blocked by my ISP, because there is none (at least at our knowledge). There is other torrent trackers that don’t work the same way as bt4g, like TorrentFunk, but I find no way to know if it’s because of my ISP or because of my setup.

I don’t know what I could try to know more…