get_local_ipaddresses() is used to run through the list of interfaces and ipautil.CheckedIPAddress(ip) is called to evaluate whether the address is usable or not. If it isn't a ValueError is raised.

This ValueError is dropped. I think it should be raised so that the reason the address is unusable is recorded. The vast majority of the time this is perfectly useless information like "cannot use loopback IP address" and "cannot use link-local IP address" but occasionally it is helpful like "cannot use IANA reserved IP address".

I don't think this will pollute the logs much and it can probably also record the addresses being evaluated.