I am running nexus3 on a Linux Mint 19.3 Tricia, named "horst" (=CNAME). The machine has several DNS aliases like (and for example) "jenkins", "nexus" etc.
So, until I updated Mint today, the (http-)URL nexus:8081 worked (like jenkins:8081, horst:8081 and every other alias, on that port of course) meaning it started nexus.
There was no update of nexus.
Now, after the update, any URL pointing to port 8081 opens nexus with http,
EXCEPT "nexus:8081" which tries to redirect to https and results in an respective error message, as https is not configured in nexus.
When I curl nexus:8081, I don't get a redirect in return, but the proper start page with proper content.
I checked with different browsers, clean cache and security settings, same symptom.
I am irritated why this happens with exactly this one URL, why it comes up now - and where to solve this problem.