For the past week, I've been getting these errors from Bing's spider:
(https://i.ibb.co/fHN3Lgk/Capture.png)
Notice that the error message is not shown and the links it's visiting have been removed in the past. Would could be causing this, and why isn't an error message available?
Sample links:
https://biology-forums.com/index.php?topic=471897
https://biology-forums.com/index.php?topic=121319
Have you looked at the links as a guest?
Error is the same. Interestingly, when I get the error as a guest, it doesn't log.
I'm not getting any errors from Bing at all.