Tweak auth timeout notify.

controller/DB.hpp

@@ -35,7 +35,7 @@
 
 #include "../ext/json/json.hpp"
 
-#define ZT_MEMBER_AUTH_TIMEOUT_NOTIFY_BEFORE 10000
+#define ZT_MEMBER_AUTH_TIMEOUT_NOTIFY_BEFORE 25000
 
 namespace ZeroTier
 {