--- loncom/lonnet/perl/lonnet.pm	2019/05/06 19:28:24	1.1410
+++ loncom/lonnet/perl/lonnet.pm	2019/07/18 18:28:58	1.1411
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # TCP networking package
 #
-# $Id: lonnet.pm,v 1.1410 2019/05/06 19:28:24 raeburn Exp $
+# $Id: lonnet.pm,v 1.1411 2019/07/18 18:28:58 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -1081,6 +1081,19 @@ sub find_existing_session {
     }
     return;
 }
+
+sub delusersession {
+    my ($lonid,$udom,$uname) = @_;
+    my $uprimary_id = &domain($udom,'primary');
+    my $uintdom = &internet_dom($uprimary_id);
+    my $intdom = &internet_dom($lonid);
+    my $serverhomedom = &host_domain($lonid);
+    if (($uintdom ne '') && ($uintdom eq $intdom)) {
+        return &reply(join(':','delusersession',
+                            map {&escape($_)} ($udom,$uname)),$lonid);
+    }
+    return;
+}
 
 # check if user's browser sent load balancer cookie and server still has session
 # and is not overloaded.