diff --git a/class2.php b/class2.php
index bba6f3c44..cfba4b392 100755
--- a/class2.php
+++ b/class2.php
@@ -1748,6 +1748,19 @@ if($fpUrl === $fpPref)
 }
 unset($fpUrl, $fpPref);
 
+$dbg->logTime('Legacy Route detection');
+// Reverse lookup of current URI against legacy e_url entry to determine route.
+if(!deftrue('e_SINGLE_ENTRY') && deftrue('e_CURRENT_PLUGIN'))
+{
+	if($route = e107::detectRoute(e_CURRENT_PLUGIN, e_REQUEST_URI))
+	{
+		e107::route($route);
+	}
+
+	unset($route);
+}
+
+
 
 
 
diff --git a/e107_handlers/e107_class.php b/e107_handlers/e107_class.php
index 90e8bdda6..22618466b 100644
--- a/e107_handlers/e107_class.php
+++ b/e107_handlers/e107_class.php
@@ -4032,6 +4032,65 @@ class e107
 		}
 	}
 
+	/**
+	 * Reverse lookup of current URI against legacy e_url entry for the specified plugin.
+	 * Useful for when SEF (e_SINGLE_ENTRY) is not in use.
+	 * @param string $route eg. forum/index (must match SEF route )
+	 */
+	public static function detectRoute($plugin=null, $uri=null)
+	{
+		if(empty($plugin) || empty($uri))
+		{
+			return null;
+		}
+
+		if(!$addon = e107::getAddon($plugin,'e_url'))
+		{
+			trigger_error("Couldn't load e_url for ".$plugin);
+			return null;
+		}
+
+		if(!$result = e107::callMethod($addon, 'config'))
+		{
+			trigger_error($plugin.' - e_url::config() method returned nothing');
+			return null;
+		}
+
+		foreach($result as $key=>$var)
+		{
+			if(empty($var['legacy']))
+			{
+				continue;
+			}
+
+			$legacy = self::getParser()->replaceConstants($var['legacy'], 'abs'); // remove {e_PLUGIN}
+			$legacy = preg_replace('/\{[\w]*\}/', '__XXX__', $legacy); // replace {fields} with placeholder.
+			$legacy = preg_quote($legacy,'/'); // add slashes
+
+			$pattern = '/'. str_replace('__XXX__', '([\w]*)', $legacy) .'/'; // replace placeholder with regexp
+
+			if(preg_match($pattern,  $uri))
+			{
+				return $plugin.'/'.$key;
+			}
+
+		}
+
+		return null;
+	}
+
+
+	public static function route($route)
+	{
+		if(defined('e_ROUTE'))
+		{
+			return null;
+		}
+
+		define('e_ROUTE', $route);
+	}
+
+
 	/**
 	 * Generate a plugin's search engine-friendly URL with HTML special characters escaped
 	 *
diff --git a/e107_plugins/forum/e_url.php b/e107_plugins/forum/e_url.php
index 5413f0629..f684e7f11 100644
--- a/e107_plugins/forum/e_url.php
+++ b/e107_plugins/forum/e_url.php
@@ -29,18 +29,21 @@ class forum_url // plugin-folder + '_url'
 			'regex'			=> '^forum/rules/?',
 			'sef'			=> 'forum/rules',
 			'redirect'		=> '{e_PLUGIN}forum/forum.php?f=rules',
+			'legacy'		=> '{e_PLUGIN}forum/forum.php?f=rules',
 		);
 
 		$config['stats'] = array(
 			'regex'			=> '^forum/stats/?',
 			'sef'			=> 'forum/stats',
 			'redirect'		=> '{e_PLUGIN}forum/forum_stats.php',
+			'legacy'		=> '{e_PLUGIN}forum/forum_stats.php',
 		);
 
 		$config['track'] = array(
 			'regex'			=> '^forum/track/?',
 			'sef'			=> 'forum/track',
 			'redirect'		=> '{e_PLUGIN}forum/forum.php?f=track',
+			'legacy'		=> '{e_PLUGIN}forum/forum.php?f=track',
 		);
 
 		$config['markread']  = array(
@@ -53,13 +56,15 @@ class forum_url // plugin-folder + '_url'
 		$config['new']  = array(
             'regex'			=> '^forum/new$/?',
 			'sef'           => 'forum/new',
-			'redirect'      => '{e_PLUGIN}forum/forum.php?new'
+			'redirect'      => '{e_PLUGIN}forum/forum.php?new',
+			'legacy'        => '{e_PLUGIN}forum/forum.php?new'
 		);
 
 		$config['post'] = array(
 			'regex'			=> '^forum/post/?',
 			'sef'			=> 'forum/post/',
 			'redirect'		=> '{e_PLUGIN}forum/forum_post.php',
+			'legacy'		=> '{e_PLUGIN}forum/forum_post.php',
 		);
 
 		// only create url  - parsed above.
@@ -94,7 +99,7 @@ class forum_url // plugin-folder + '_url'
 			'regex'			=> '^forum\/?$', 						// matched against url, and if true, redirected to 'redirect' below.
 			'sef'			=> 'forum', 							// used by e107::url(); to create a url from the db table.
 			'redirect'		=> '{e_PLUGIN}forum/forum.php', 		// file-path of what to load when the regex returns true.
-
+			'legacy'		=> '{e_PLUGIN}forum/forum.php',
 		);
 
 
@@ -106,8 +111,6 @@ class forum_url // plugin-folder + '_url'
 		);
 
 
-
-
 		return $config;
 	}
 	
diff --git a/e107_plugins/forum/forum.php b/e107_plugins/forum/forum.php
index c90123751..f6a930bb4 100644
--- a/e107_plugins/forum/forum.php
+++ b/e107_plugins/forum/forum.php
@@ -97,7 +97,6 @@ class forum_front
 
 				case 'rules':
 					include_once(HEADERF);
-
 					$this->forum_rules('show');
 					include_once(FOOTERF);
 					exit;
diff --git a/e107_tests/tests/unit/e107Test.php b/e107_tests/tests/unit/e107Test.php
index 1d9b3656b..1d978994e 100644
--- a/e107_tests/tests/unit/e107Test.php
+++ b/e107_tests/tests/unit/e107Test.php
@@ -1314,13 +1314,51 @@ class e107Test extends \Codeception\Test\Unit
 
 	}
 
+	function testDetectRoute()
+	{
+		e107::getPlugin()->install('forum');
 
+		$tests = array(
+			0 => array(
+				'plugin'    => 'forum',
+				'uri'       => '/e107_plugins/forum/forum.php?f=rules',
+				'expected'  => 'forum/rules',
+			),
+			1 => array(
+				'plugin'    => 'forum',
+				'uri'       => '/e107_plugins/forum/forum_viewforum.php?id=543123',
+				'expected'  => 'forum/forum',
+			),
+
+		);
+
+		foreach($tests as $index => $var)
+		{
+			$result = e107::detectRoute($var['plugin'], $var['uri']);
+			if(empty($var['expected']))
+			{
+				echo $result."\n";
+				continue;
+			}
+
+			$this->assertSame($var['expected'], $result);
+		}
+
+
+
+
+
+		e107::getPlugin()->uninstall('forum');
+
+	}
+
+/*
 				public function testThemeLan()
 				{
 					$result = e107::themeLan(null, 'basic-light');
 					var_dump($result);
 
-				}
+				}*/
 	/*
 				public function testLan()
 				{