Why is this host blocked since many month https://wuprop.boinc-af.org/show_host_detail.php?hostid=260736 ?
Also the until date is not shown.

yoyo

From what I've seen, checking under "Application Details", the site reports '# of tasks reported today: 7", and "Valid Tasks: 0".

From what I've gathered, if several WUprop tasks are returned and don't validate for some reason, (up to 6 in a row) the host is blocked (I've gathered it can last up to 24 hours), in case there's a problem and to temporarily avoid wasting the server's time.

As for why it doesn't say how long... Don't know.

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yoyo_rkn,
Not sure if this still applies - Sebastian answered a similar question a little more than 3 years ago in post 8869:

Since the restart of the projects, 25% of returned results were invalid.
To prevent too many invalid results, I introduced a temporary ban for hosts which returns too many invalid results.

An host which returns 12 or more invalids results in 24 hours will be banned for 24h. In case of recidive, bannish time will be longer.

You can know the ban time limit visiting host details. For example: https://wuprop.boinc-af.org/show_host_detail.php?hostid=154599

For information, a result is invalid if only wuprop project runs on this host. Running only NCI applications is allowed.

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The host has not returned a single result since January, because the host is blocked.

Guessing the BOINC event log shows 'not accepting work from this host' or something pretty similar?

Well, another one, first for me: https://wuprop.boinc-af.org/results.php?hostid=261009

Why it is now blocked? It is not of case An host which returns 12 or more invalids results in 24 hours will be banned for 24h, 6 invalid tasks before I did reboot it and now it is blocked?

(This computer has been banned until 27 Sep 2025, 9:00:03 UTC)

Just be patient. It will be automatically fixed in a day.