[SOLVED] Logitech Harmony Hub Binding - 4.15.206 firmware broke local API connection

Does anybody have some light to shed on this issue?
Driven by the idea that Logitech was going to shove this firmware update down my throat I installed PiHole and made it responsible for DNS and DHCP in my network. IP changed for the Harmony Hub. After the downgrade I was and still am unable to reconfigure/contact the Hub.

Any input is greatly appreciated, this was one of the best integrations of OpenHAB and KNX for me.