Recently upgraded most of my 2012 r2 domain controllers to 2016. Now ADAC & ADUC cannot search the directory, but can browse the domain to find the object, and i can search with powershell. My 2012r2 server still can search the domain. No obvious errors in the event log and all the prereqs for 2016 have been met. the only possible issue I see is we are still using FRS for replication. Has anyone seen any issues like this, or have any ideas?