diff --git a/krebs/2configs/shack/share.nix b/krebs/2configs/shack/share.nix
index 247b9ee7d..465d6ef69 100644
--- a/krebs/2configs/shack/share.nix
+++ b/krebs/2configs/shack/share.nix
@@ -33,6 +33,10 @@
       printing = bsd
       printcap name = /dev/null
       disable spoolss = yes
+
+      # for legacy systems
+      client min protocol = NT1
+      server min protocol = NT1
     '';
   };
 }