diff --git a/xCAT-server/lib/xcat/plugins/updatenode.pm b/xCAT-server/lib/xcat/plugins/updatenode.pm
index c6407795b..453474a14 100644
--- a/xCAT-server/lib/xcat/plugins/updatenode.pm
+++ b/xCAT-server/lib/xcat/plugins/updatenode.pm
@@ -971,6 +971,26 @@ $AIXnodes_nd, $subreq  ) != 0 ) {
     #
 
     if ($request->{security} && $request->{security}->[0] eq "yes") {
+       # check to see if the Management Node is in the noderange and
+       # if it is abort
+        my $mname;
+        my $tab = xCAT::Table->new('nodetype');
+        my @nodelist2=$tab->getAllNodeAttribs(['node','nodetype']);
+        foreach my $n (@nodelist2) {
+           if ($n->{'nodetype'} eq "mn") {  # this is the MN
+              $mname=$n->{'node'};
+              last;
+           }
+        }
+        if ($mname) {  # MN in the database
+         if (grep(/$mname/, @$nodes)) { # if MN in the noderange
+            my $rsp = {};
+            $rsp->{error}->[0] =
+              "You must not run -K option against the Management Node:$mname.";
+            xCAT::MsgUtils->message("E", $rsp, $::CALLBACK, 1);
+            return;
+         }
+        }
          
         # generate the arguments
         my @args = ("-K");