I’m seeing a problem similar to that reported in this topic:
For a forum running on
forum.breadtopia.com, as of recent discourse updates we are unable to onebox posts from the wordpress site at
breadtopia.com. Prior to recent updates oneboxing from the wordpress site worked fine.
In this case, there is definitely an internal private network IP active between the two servers and the web server on
breadtopia.com is not listening on the private IP address. This has not changed recently - the private IP has always been there and nginx on
breadtopia.com has never listened on that address.
The forum is running version 1.9.0.beta3 and I have used the new whitelist feature (@eviltrout) to whitelist
breadtopia.com but oneboxing for that domain is still not working and the console shows a 404 error.
Here is a recent example post that should have a onebox:
Here is an older post where the oneboxing worked correctly for the same domain: