[Bug Report] [Failure reason \"This client is not allowed...]

[Suitear]

OS: Debian 11/10, Ubuntu 20.04
Client: rtorrent 0.9.8/libtorrent 0.13.8

On several trackers, the tracker would occasionally give feedback like:
`Tracker: [Failure reason "This client is not allowed. Please goto xxxx.com/faq.php#id29 for a list of acceptable clients"]'

I install rtorrent0.9.8/libtorrent0.13.8 via source compilation at first. And after I found this issue, I reinstall rtorrent via apt way.
But it didn't solve this problem in either way. By the way, rtorrent is on client whitelist of those trackers.
So I asked reletive staff on those trackers for help. Their reply is as follows.

The high probability is the http/2 bug of libcurl, which the new version of transmission has fixed, but rTorrent has not been maintained for a long time. The bug will cause random data-reports to be lost (As for client, it will appear as an illegal client).

Solution: rTorrent has not updated to fix this bug. Therefore, if you want to solve the problem, you can only change QBittorrent/Transmission. Or live with it`

So please look into this. Thanks.

[kannibalox]

If this is the bug in question: transmission/transmission#1563, then just like with transmission, the fix needs to come from an updated version of curl. Following the ticket trail, it looks like the earliest version with the fix is 7.75.0, or you can try downgrading curl to a previous version. Unfortunately it doesn't look like there's anything that can be changed in rTorrent to fix this.

Edit: it looks like it was introduced in version 7.71.0, so anything between that and 7.75.0 would be effected

[Suitear]

Thanks. So if I upgrade curl to 7.75+ independently, it would be solved?

[kannibalox]

As long as rtorrent is linked against 7.75+, I would expect things to work correctly.