--- loncom/auth/lonlogin.pm	2018/07/04 16:58:19	1.173
+++ loncom/auth/lonlogin.pm	2018/11/24 16:19:04	1.174
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Login Screen
 #
-# $Id: lonlogin.pm,v 1.173 2018/07/04 16:58:19 raeburn Exp $
+# $Id: lonlogin.pm,v 1.174 2018/11/24 16:19:04 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -106,6 +106,30 @@ sub handler {
 	return OK;
     }
 
+    $env{'form.firsturl'} =~ s/(`)/'/g;
+
+# Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
+
+    my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r,1);
+    if ($found_server) {
+        my $hostname = &Apache::lonnet::hostname($found_server);
+        if ($hostname ne '') {
+            my $protocol = $Apache::lonnet::protocol{$found_server};
+            $protocol = 'http' if ($protocol ne 'https');
+            my $dest = '/adm/roles';
+            if ($env{'form.firsturl'} ne '') {
+                $dest = $env{'form.firsturl'};
+            }
+            my $url = $protocol.'://'.$hostname.$dest;
+            my $start_page =
+                &Apache::loncommon::start_page('Switching Server ...',undef,
+                                               {'redirect'       => [0,$url],});
+            my $end_page   = &Apache::loncommon::end_page();
+            $r->print($start_page.$end_page);
+            return OK;
+        }
+    }
+
 #
 # If browser sent an old cookie for which the session file had been removed
 # check if configuration for user's domain has a portal URL set.  If so
@@ -123,8 +147,6 @@ sub handler {
         }
     }
 
-    $env{'form.firsturl'} =~ s/(`)/'/g;
-
 # -------------------------------- Prevent users from attempting to login twice
     if ($handle ne '') {
         &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);