diff --git a/install/debian/proftpd.conf b/install/debian/proftpd.conf
index 0930fb11..532efab0 100644
--- a/install/debian/proftpd.conf
+++ b/install/debian/proftpd.conf
@@ -16,6 +16,7 @@ LogFormat                       default "%h %l %u %t \"%r\" %s %b"
 LogFormat                       auth    "%v [%P] %h %t \"%r\" %s"
 ListOptions                     -a
 RequireValidShell               off
+PassivePorts                    12000 12100
 
 <Global>
   Umask                         002