--- loncom/lonnet/perl/lonnet.pm	2013/10/06 14:20:36	1.1240
+++ loncom/lonnet/perl/lonnet.pm	2013/10/12 01:15:38	1.1242
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.1240 2013/10/06 14:20:36 raeburn Exp $
+# $Id: lonnet.pm,v 1.1242 2013/10/12 01:15:38 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -356,8 +356,11 @@ sub get_remote_globals {
 }
 
 sub remote_devalidate_cache {
-    my ($lonhost,$name,$id) = @_;
-    my $response = &reply('devalidatecache:'.&escape($name).':'.&escape($id),$lonhost);
+    my ($lonhost,$cachekeys) = @_;
+    my $items;
+    return unless (ref($cachekeys) eq 'ARRAY');
+    my $cachestr = join('&',@{$cachekeys});
+    my $response = &reply('devalidatecache:'.&escape($cachestr),$lonhost);
     return $response;
 }
 
@@ -1985,6 +1988,7 @@ sub inst_userrules {
 
 sub get_domain_defaults {
     my ($domain,$ignore_cache) = @_;
+    return if (($domain eq '') || ($domain eq 'public'));
     my $cachetime = 60*60*24;
     unless ($ignore_cache) {
         my ($result,$cached)=&is_cached_new('domdefaults',$domain);
@@ -6201,7 +6205,7 @@ sub usertools_access {
     }
     return if (!defined($tools{$tool}));
 
-    if ((!defined($udom)) || (!defined($uname))) {
+    if (($udom eq '') || ($uname eq '')) {
         $udom = $env{'user.domain'};
         $uname = $env{'user.name'};
     }