For some unknown reason, one of my domain controller servers has changed its network location from domain to public:
This is annoying because the 'public domain' firewall then starts blocking all unknown incoming traffic to my server.
We need to change this network location to be domain. However sometime, the location name is not clickable!!
To fix this, I found a trick:
Navigate to this network properties and un-tick the
Internet Protocol Version 6 (TCP/IPv6) stack
Click OK
Then it should change the network location type to domain
Now you can change the IPv6 stack back ON
