This dot release fixes a possible crash if you have parse errors in your conf and REHASH. Also, if you use UTF8 regexes in spamfilter { } blocks (which is a new feature in 6.1.2) then these were not working when booting the IRCd but they would work after a REHASH. The problem with this is that if you were happily adding UTF8 spamfilter blocks you could create an unbootable IRCd until you removed those spamfilter blocks. This is fixed now. Two other fixes are: ::exclude-security-group not working and we now give DNSBL lookups some more time.
To upgrade or not?
If you are already on a previous 6.1.2.x then there may be little need to upgrade, though there is that potential crash when you typo your config file, like a missing ; or }. For new installations, we do recommend using 6.1.2.3 and not an older 6.1.2.x.
Download
As always, UnrealIRCd can be downloaded from https://unrealircd.org/ and on *NIX you upgrade with: ./unrealircd upgrade