I have a small network with 5 PCs and 1 iMac. PCs are Win7 Pro and iMac is OSx 10.12.4 (sierra).
All 6 computers have the same DNS address. 10.0.1.25 (statically assigned) and all the computers are hardwired and on the same network.
From the PCs I can ping and resolve activedirectorydomain.local to 10.0.1.25 but from the Mac I can't.
I get this error ping: cannot resolve: activedirectorydomain.local: Unknown Host.
From the Mac and from the PCs I can ping 10.0.1.25. So I think this is a DNS issue. It's almost like the Mac is not accepting my statically assigned DNS address for some reason.