When writing in topics in our Discourse site, when pasting some links, Discourse cannot retrieve OpenGraph (OneBox) information. We get an error like this (see also in screenshot): >Sorry, we were unable to generate a preview for this web page, because the following oEmbed / OpenGraph tags could no…

[afbeelding] wlandgraf: When writing in topics in our Discourse site, when pasting some links, Discourse cannot retrieve OpenGraph (OneBox) information. We get an error like this (see also in screenshot): Hi there - i tested that particular link you posted and it oneboxes as expected. clearly…

@Lilly thank you for your response. I have version `2026.01.0-latest`. I can update to `2026.2.0` of course, but my version is not that old. Yes, all other oneboxes work in my forum. Just that ones don’t work. About my onebox settings, they are all default. If I click “Only show overriden” nothing…

Why Can't Discourse Retrieve OpenGraph Data?

Ondersteuning

wlandgraf (Wagner Landgraf) 11 maart 2026 om 14:27 4

Ok, I found the problem, it looks like Discourse server doesn’t have the recent certificate chain used by the server.

Topic		Antwoorden	Weergaven
Link preview not working for specific site Support	11	2368	12 januari 2020
Onebox error but OG tag present Support	2	518	3 januari 2021
Website Links pasted into a Topic Feature	5	1171	18 september 2021
Why Do Some Blog Posts in Discourse Have A Preview? Support	9	2278	3 juli 2023
Link-image not shown Self-hosting unsupported-install	17	489	17 juni 2024

Why Can't Discourse Retrieve OpenGraph Data?

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