MSHARED-429 introduced handling of hostnames endling with .local though they are invalid in the way they are used.
Copied from the ticket:
I'd seriously like to revert this partially for 3.0:
- Your DNS setup is simply broken. .local is a reserved TLD for mDNS resolution. This is not meant to be used in private networks. Doing so breaks Avahi on Linux/FreeBSD, Bonjour on macOS and everything else using zeroconf. You should register a domain name and use subdomains on your private network (https://de.wikipedia.org/wiki/Zeroconf#Multicast_DNS).
- It does not accept full 16-bit unsigned integer
- You always have to update with the newest pattern in Commons Validator
Local hostnames (unqualified) can be validated by passing an option/flag to the validator. The rest of the patch, missing TLDs, etc. are already in Commons Validator 1.5.1.
We should not encourage bad setups.