I use a reverse proxy so I still use DNS name to access internally.
I believe some things are populated by your hostname in the lemmy configs so straight IP may break a few things.
I had the same issue as OP when setting up my instance. Properly setting the domain name in all the config files fixed it for me. So I am assuming you are right.
You’ll probably want to do it by dns name
When you say internally, do you mean behind a NAT, or something to that effect?
I mean from the same LAN.
It worked on 0.17.4, but on 0.18.0 I get the error you get
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