I had a legitimate user message me directly saying that they could not sign up up because “New registrations are not allowed from your IP address”
After some investigation I found the relevant setting and bumped it up to 9999. But then I wanted to investigate further, so looked up the users reg IP after they signed up:
The other threads about this setting seem to indicate that repeat reg IPs should not be common, that the low default of 3 is reasonable. So does this situation with multiple reg ids coming from Cloudflare point to some misconfiguration I need to look in to? This instance is running on Digital Ocean, and there is just an A record on CloudFlare pointing at it.
As an aside I would strongly suggest admins be notified when users are turned away for this reason. I would never have known about or been able to help them sign up except that they emailied me directly.