[@moonoi Participant 15 years, 6 months ago]

Adding to the question above:

I found out that when I type in /blog/forum/test-forum I’m not redirected but just shown the 404 page. All other combinations ends in a redirect back to the front page.

I can see in the posts table that WP saved the permalink as http://localhost.localdomain/?post_type=forum&p=8053. Requesting this URL just results in the redirect.

I already tried saving permalinks settings a number of times. I also tried each of the custom structure combinations mentioned in here such as /%post-type%/%post-name%/etc., and I tried disabling “neat” permalinks all together. Nothing seems to work.