I had to block some external instances on Masto.host shared hosting.
Here is why and how that can be reverted: https://masto.host/i-had-to-block-some-external-instances/
This was a tricky decision but couldn't think of a better solution.
If you have any suggestions, please do let me know.
@mastohost Is the bug tracked somewhere on the Mastodon project? If the maintainer(s) know about it, maybe they could help with a fix for 2.4.x boxes.
Even if the fix is to auto-reject requests from old instances that could cause this bug, at least then you wouldn't have to manually keep checking if they've upgraded yet.
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