Index: sites/all/modules/cas/cas.module
===================================================================
--- sites/all/modules/cas/cas.module	(revision 125)
+++ sites/all/modules/cas/cas.module	(working copy)
@@ -109,6 +109,8 @@
     }
     else {
       phpCAS::client($server_version, $server_cas_server, $server_port, $server_uri, $start_session);
+      global $base_url;
+      phpCAS::setFixedServiceURL($base_url);
     }
     // force CAS authentication
     // Determine if CA option is set.  This is only avialable in version 0.6 or greater, so we need to test