Yes the problem is Little Snitch. Now ethernet and wifi works perfect. I un-installed Little Snitch from my M4 Mini OS 15.1.1. It was causing network and connectivity fails. Especially with VPNs and DoH app. LS does not do this on my 2014 i7 Mini or Late 2015 iMac both OCLP'd OS 14.7.1. Apple has changed how the kernel/extensions/firewalls are implemented. I have not had any issues since un-installing Little Snitch completely. (App prefs & configuration files). I will proceed to investigate further when 15.2 is live. Sad😩cuz I like Little Snitch. Apple seems to be further locking down the Mac.