How to remove a DFS namespace server if not accessible:
in the example below; I have a DFS root called dfsroot and two domain controllers not accessible.
how to remove those namespace servers from a command line because dfsmgmt.msc cannot do it:
dfsutil diag unmapdomroot \\my.domain.local\dfsroot \\dcserver1\dfsroot
dfsutil diag unmapdomroot \\my.domain.local\dfsroot \\dcserver2\dfsroot