Hi @angus, I can't be certain about what is actually happening, which needs an admin and knowledgeable person with the ActivityPub plugin, but I observe that this forum becomes slow or even unreachable at times and it looks to be related somehow to posts that are being federated. Notified about that…

I also noticed that SH becomes unresponsive when I publish a reply. This is because replies are delivered to many other servers, which start to load the reply tree, all at once. Sorry about that

if this is the case, then it is basically a "thundering herd" issue similar to how link previews can cause issues. to which the mitigation is that softwares should stop auto-fetching resources that might not ever be seen, and to instead use on-demand deferred "lazy loading" strategies.

Hey guys, I’ll have a closer look at this soon, hopefully tomorrow.

I disable my plugin for that trouble I’ve received many request no stop from the same souce-instance or many others instances making the same type of request without none delay limit, sorry but this is weird all time requesting and flooding my server is too much.

angus: Hey guys, I’ll have a closer look at this soon, hopefully tomorrow. I don’t want to put pressure, and it may be inconvenient time now in the Summer vacation period, but if you have an opportunity to delve into the issue it would be great. Right now a single federated post may make the forum v…

Hey guys, if this is causing serious issues, I would note there a number of tools already in the plugin a community admin can use for this kind of scenario. There is comprehensive logging, including object logging, you can use to determine the source of any troublesome actors. activity_pub_verb…

Ok, SocialHub loaded, I fired up the logs and the culprit seems relatively clear. [Screenshot 2025-08-10 at 16.54.34] I’d suggest adding mastodon.sdf.org to the blocklist and sending a note to their admins that they’re spamming socialhub. *edit It seems another issue was that signed requests had…

Thanks for your quick reply, @angus. I am just a regular member of this forum, but this looks to be useful info for @how or other forum admins to look into.

No worries. I suspect simply enabling signed requests and adding mastodon.sdf.org to the blocklist is all that is needed.

[Bild] angus: I’d suggest adding mastodon.sdf.org to the blocklist It should block everywhere. It acts as a DDOS-agent. Amount of requests it does is totally horrible.

AP processing bremst das Forum aus?

Unterstützung

angus (Angus McLeod) 15. Juli 2025 um 07:55 4

Hallo Leute, ich werde mir das bald genauer ansehen, hoffentlich morgen.

Thema		Antworten	Aufrufe
How to debug connectivity issues with ActivityPub Administrators activitypub	22	580	27. Januar 2025
Replies from the Fediverse not visible in Discourse: "Perhaps this topic was closed or deleted while you were looking at it?" Support activitypub	2	94	1. April 2025
Local ActivityPub Actors are being created without keypairs Support activitypub	20	230	17. März 2025
Activitypub returning null pages Bug activitypub	3	136	31. Dezember 2024
Why are supposedly ActivityPub-federated Discourse threads inaccessible via external AP clients? Bug activitypub	15	335	20. Mai 2025

AP processing bremst das Forum aus?

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