I was able to add IPv6 on four HardenedBSD relays I run however I have now noticed a number of malicious login attempts. I am wondering if there is some correlation with the IPv6 or just a coincidence?
however I have now noticed a number of malicious login attempts
Using a non standard ssh port and blocking power 22 should reduce the bot login attempts.
(If you’re running a VPS be sure to test your custom port before blocking 22)
I don’t see a relationship between IPv6 and login attempts though. You could have entered your IP on malicious site to test IPv6.