Index: branches/RC/core/kernel/session/session.php
===================================================================
diff -u -N -r10580 -r10591
--- branches/RC/core/kernel/session/session.php	(.../session.php)	(revision 10580)
+++ branches/RC/core/kernel/session/session.php	(.../session.php)	(revision 10591)
@@ -426,9 +426,14 @@
 		$this->CookiePath = str_replace(' ', '%20', $path);
 	}
 
+	/**
+	 * Setting cookie domain. Set false for local domains, because they don't contain dots in their names.
+	 *
+	 * @param string $domain
+	 */
 	function SetCookieDomain($domain)
 	{
-		$this->CookieDomain = '.'.ltrim($domain, '.');
+		$this->CookieDomain = substr_count($domain, '.') ? '.'.ltrim($domain, '.') : false;
 	}
 
 	function SetGETName($get_name)