Do you have a couple server or admin nodes, but you don’t want members to be able to talk to each other?

Check the manual for theory about how rules work.

tag server
  id 2
  enum 0 No
  enum 1 Yes
  default No;

# if neither member is a "server", break
break not tor server 1;

  
# This is required because the default action is 'drop'.
accept;

See the "Tags Matrix" in the section below after saving the rules. Set your servers to “Yes”