Index: taxonomy_access.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/taxonomy_access/taxonomy_access.module,v
retrieving revision 1.107.2.7
diff -u -p -r1.107.2.7 taxonomy_access.module
--- taxonomy_access.module	15 May 2009 01:23:33 -0000	1.107.2.7
+++ taxonomy_access.module	17 Jun 2009 13:46:58 -0000
@@ -158,6 +158,15 @@ function taxonomy_access_init() {
     include_once($path .'/taxonomy_access_admin.inc');
     drupal_add_css($path .'/admin.css');
   }
+
+  // Restrict direct access to forum/$tid paths.
+  if (arg(0) == 'forum' && is_numeric($tid = arg(1))) {
+    if (!db_result(db_query(db_rewrite_sql("SELECT COUNT(t.tid) FROM {term_data} t WHERE t.tid = %d", 't', 'tid'), $tid))) {
+      drupal_access_denied();
+      module_invoke_all('exit');
+      exit;
+    }
+  }
 }
 
 /**