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…

[image] 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 this…

@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?

Support

wlandgraf (Wagner Landgraf) March 11, 2026, 2:27pm 4

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

Topic		Replies	Views
Link preview not working for specific site Support	10	2407	December 13, 2019
Onebox error but OG tag present Support	2	521	January 3, 2021
Website Links pasted into a Topic Feature	5	1181	September 18, 2021
Why Do Some Blog Posts in Discourse Have A Preview? Support	7	2308	October 22, 2019
Link-image not shown Self-hosting unsupported-install	16	534	June 16, 2024

Why Can't Discourse Retrieve OpenGraph Data?

Related topics